Laboratoires Osma


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Laboratories Osma Alum Block, Extra Large

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  • Laboratories Osma Alum Block is manufactured from 100% pure crystalline alum and is an extremely effective antiseptic. Helping to stem bleeding from nicks and cuts and reducing razor burn means it should be an integral part of your daily shave. A plastic case is also included with this extra large block to keep it within hands-reach at all times.

    Weight: 3.5 oz (100 g)
    Made in France
  • We offer Free Shipping for qualified Canadian orders over $CDN50.00 after any discounts and before taxes; some conditions apply. Eligible customers must select the FREE SHIPPING option on the shipping page, during the checkout process, to take advantage of the offer.

    Transit time for the free shipping option in Canada is normally 2-5 working days. Transit times for other shipping methods are automatically calculated for you during the checkout process.

    For orders that do not qualify for Free Shipping, we offer discounted Canada Post and UPS shipping rates. To calculate the rate to your destination, click on the "Estimate shipping cost" link on the shopping cart page.

    Unfortunately, because of high shipping costs, we cannot offer Free Shipping for:

    • Orders outside Canada and the U.S.A.
    • Orders from Canadian Territories (Northern Territories, Yukon and Nunavut).
    • Orders from Alaska, Hawaii, US Military Addresses (APO, AFO, etc).

    For more information about shipping policies click here (opens in a new tab).

  • We will offer a full refund or store credit for unused products if returned to us within 365 days of the order date. New, unused and unopened (for items that come in sealed packaging) merchandise will be refunded in full. Please note that:

    • Products must be in their original packaging, with all manufacturer seals intact. We cannot accept any products with missing or torn packaging.
    • For hygienic reasons, no used products can be accepted. Merchandise damaged by the buyer is not eligible for refunds.
    • Products returned 60 days after delivery date will receive a store credit
    • The buyer is responsible for returning the items, and the refund will be issued only after we receive the merchandise. So we encourage our clients to send the return through a shipping method that provides insurance and tracking number.
    • Refunds cover the price of the purchased products plus applicable taxes. Shipping charges and taxes on the shipping charges are not refundable.

    For more information about return procedures,  click here (opens in a new tab).

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Customer Reviews

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  • Reviews (14)
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Jonathan A.

A must have for everyone

This is great for closing up cuts and nicks, stings but soothes razor burn better than any cream can. A must have addition for everyone.


A very good product!

This is the best alum block I have ever used!

Eric S.

Best alum block

This is the best alum I used so far, it is smooth like glass against the skin. The other brands break up in smaller pieces, but not this one. It is more pricey, but worth every penny. I will purchase again.

Sean S.

Smart Purchase

Started using Alum when I began DE shaving a number of years ago and it has become an essential part of the ritual. Tightens the skin just a bit and makes quick work of any nicks and cuts. In my opinion it should be an essential in the new shaver's kit. The Laboratories Osma Alum Block, extra large, is the best I have used and is easy to handle.

Frank P.

Best Alum Block I've Used

I like how my skin feels when using an alum block after shaving. However the Laboratories Osma Alum Block is clearly the best. I also like how the large size fits your hand. It doesn't slip.

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