IPU1010 Features: * Perfectly flat machined surface * Hard surface tension * Flexible * Perfect density for block sanding * PatentedThe original Dura-Block. Designed by people in the shop looking for a "solution to the problem". The TADAF4400 is designed to block curved or flat panels. Durable, high density EVA foam. No dents, no ripples. 3/4"H x 1 3/8"W. * Dura-Block Standard Sanding Block Warranty: * Lifetime warranty does not cover abuse