Avant gauze drain sponge, 4" x 4", 6 ply, sterile 2's.This sponge features an extra fenestration which allows it to lay flat when wrapped around a drainage tube.Without it, the sponge will pucker, decreasing effectiveness by allowing fluids to pool around the drain tube.Includes all the benefits of non-woven avant gauze.Each 6-ply rayon/polyester sponge is highly absorbent, low-linting and fast wicking to wound beds.