The Dermacea™ I.V. Drain Sponge is made of a synthetic blend of rayon and polyester that helps provide fast wicking action and superior absorbency. The unique pre-cut T-slit conforms snugly around drains, catheters, chest tubes, I.V.'s and tracheotomies. 2" x 2" (5.1 cm x 5.1 cm).