Made of the finest all-cotton gauze. Sponges feature a full 4" barium monofilament and a 7" all-cotton blue loop unless noted. Available in Tyvek trays and LapPack packaging, both with and without CSR wrap as indicated below. All are sterile unless otherwise noted. Features: Made of the finest long staple cotton, 4-ply gauze, Consistent 4" internal barium ribbon for x-ray detectability. Bleached without chlorine.