Covidien Curity Sterile Cover Sponges 4" x 4" (2913). Curity Sterile 2's Cover Sponges consist of cellulose wadding covered with a non-woven fabric. Economical, all-purpose sponge with good absorbent capacity. Non-sterile sponges conveniently indexed in 10's for faster, easier handling. 50/BX (25pks of 2). Priced per box. FREE Shipping!