Covidien (fka Kendall) Excilon - 4" x 4" Drain Sponges (6 Ply) are drain sponges that are made of 50% polyester and 50% rayon material. This 6 ply sponge is made in the USA . Used to protect, isolate and maintain drain and tube sites, this drain sponge quickly absorbs large amounts of exudate and fluid.