The Alum block is an old staple in traditional barbershops. Simply run the Bloc Osma under cold water and rub it on your face after shaving; the Alum will quickly sooth any irritation and razor burn, as well as close any small nicks or weepers. Astringent and antiseptic, it will also balance the PH of your skin leaving your face wonderfully toned. OSMA Laboratories has been hand-shaping Alum blocks in France since 1958; they are true masters of their craft. These blocks will last at least several months of daily use. Many wet shavers consider Osma Bloc the highest quality Alum block on the market. 100% Natural Potassium Alum. 2.65oz/75g. $8.00