The 4 x 4 ¾ x ½ in. thick sanding sponge is made of aluminium oxide on a foam sponge. This sponge is usable on both sides and allows it to take on the exact shape of the wood.

Siaponge sanding sponge can be used for the sanding of hard, soft or veneering woods and also for the sanding of paint and varnish.