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Osma Alum Block (Premium Quality)

Brand: Osma  |  SKU: PR18
Collection: Alum Block
Regular price $1995

Pickup available at Auckland Showroom

Usually ready in 1 hour

Free Urban Delivery
Over $120

60-Day Return Promise
(Unused & Original)

Trusted by Over
30,000 Kiwis

Shipping & Delivery

Same-Day Dispatch by 4pm | 100% Local NZ Stock

Fast shipping via NZ Post. Delivery target; next working day (our reports show that 94% of urban orders arrived within 1–2 business days in Apr 2026).

  • Free Urban Delivery on orders over $120 (Standard: $6.95)
  • Discounted Rural Delivery just $4.99 over $120 (Standard: $10.95)

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We offer a 60-Day Return Promise. If your purchase isn’t quite right, simply return it unused / unopened and in its original condition within 60 days of delivery for a refund.

Highlights

Take a Closer Look

This premium quality French Osma alum block will help soothe irritation and razor burn after shaving. It is an all-natural astringent that helps stop minor nicks and cuts from bleeding. It is a crystal-like stone that is moistened with cold water and gently rubbed over the entire face to act as an antiseptic. Leave it on for a minute or so, then rinse it off with cold water.

Not only does it aid in soothing skin irritation, but the properties in alum also ensure that the beard bristles grow straight out from your face and neck, which prevents ingrown hairs.

  • Premium Alum Block
  • Smooth surface and bevelled edge
  • Genuine Osma Labs
  • Made in France since 1957
  • Size 75g, 55mm x 35mm x 22mm
  • This Osma Alum Block comes in a cardboard box


Important note:

Don't use the alum block before wet-shaving.
DO NOT use around the eyes or sensitive areas.

Key Features

  • Rating out of 5
    4.94
  • Made in
    France

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Premium alum block highly praised for stopping shaving cuts instantly. Customers said it "soothes the skin" and "closes up all nasty cuts." Made of quality crystals, exceptionally long-lasting. Works effectively after wet shaving to prevent irritation. Some feel it's similar to cheaper alternatives.

  • Stops cuts instantly! I was surprised how effective it is.
  • Fantastic for soothing the skin after shaving, really soothes the skin preventing irritation.
  • Instantly soothes the skin. Now it's just part of my shaving routine.
Price (positive)Shaving (positive)Block (positive)Quality (positive)Cuts (positive)
  • 5 stars: 16 (94%)
  • 4 stars: 1 (6%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Anonymous (Canterbury, New Zealand)
Do you recommend this Product?: Yes
Works great on shaving cuts

my partner was skeptical but he loves it

S
S.A. (Wellington, New Zealand)
Do you recommend this Product?: Yes
Great product and price

Seems to be the best Alum bar on the market, works as you would expect.

L
L.B. (Auckland, New Zealand)
Do you recommend this Product?: Yes
Quality

Quality alum block made up of crystals unlike others further processed before pressing into block. Long lasting

B
B.S. (Auckland, New Zealand)
Do you recommend this Product?: Yes

Great product, speedy response

M
M.M. (Northland, New Zealand)
Do you recommend this Product?: Yes
A must have for shaving

This product is fantastic for soothing the skin after shaving, I have used it for shaving my head bald and really soothes the skin preventing irritation. The best thing though is it closes up all nasty cuts seals the skin. Fantastic product and thanks fineshave for being excellent to deal with.

V
V.A. (Auckland, New Zealand)
The skin heals

The Alum block really heals my skin after shaving. I suggest after applying the alum block give it a few minutes then wash it off. Dry your skin and apply a moisturiser.

M
M. (Auckland, New Zealand)
Okay, I get it now

First time user an hour ago. Instantly soothes the skin leaving a grippier, tighter feel after rinsing.
I will be using it after every shave. Now it's just part of my shaving routine. Get some and use it.

E
E. (Auckland, New Zealand)
A valuable addition to the routine

Used as instructed it made the usual couple of blood spots vanish and the skin squeaky after washing off. I noticed the proraso green aftershave had a much more noticeable cooling effect as well. Really recommended, especially since they apparently last forever.

S
S.C. (Auckland, New Zealand)
Brilliant !!

Have tried other lotions and methods to stop shaving cuts and nicks. This is the ultimate. Easy. No mess and stops cuts instantly! I was surprised how effective it is. A+++

L
L.M. (Auckland, New Zealand)

I don't think it's any different from the cheaper alums, but it last forever so eh

H
H.B. (Canterbury, New Zealand)
First alum

Great product easy to use, stop nicks from bleeding and gives feedback on where you shave too close to the skin. Not sure how others stack up but I'll probably buy this one again.

J
J.J.U.
Its great, I cant believe

Its great, I cant believe how quick it seals up the nicks.

J
J.H.
Osma Alum Block

Excellent addition to the shaving process. A must have!

P
P.
Every man needs one of these.

I've had one of these for 5 years (since I turned 40) and it looks like it may well outlast me, I use it after every wet shave and it's amazing how it takes the sting out of my occasional rush jobs in the mornings with a DE razor. After a proper run of one of my straights it finishes the job off nicely.

T
T.
Haven't had an Alum block

Haven't had an Alum block for a while and this is the best one. Despite using it every day I'm sure it will outlast me.

P
P.B.
Haven't had an Alum block

Haven't had an Alum block for a while and this is the best one. Despite using it every day I'm sure it will outlast me.

S
S.
A+++

Have been looking for the shaving stone for a while after getting one from Morocco so very happy with it. Great product, incredibly quick and efficient service would definitely use Fine Shave again !!