Pure Sponge Individual BlisterDSI Pure Sponge is a sterile, bioabsorbable, collagen protein matrix, designed to provide an occlusive semi occlusive cover for a wound, primarily to maintain a clean and moist environment for healing. It is made out of purified 100% bovine collagen type 1, it is completely sterile and each sponge is packed individually. The contact of DSI Pure Sponge with blood leads to the aggregation of platelets which precipitate on the collagen matrix,