Nonsterile gauze sponge contains blue X-ray detectable barium sulfate strands for easy identification.. Dual-colored element combines blue radiopaque strand with white strand which is visible when sponge is saturated with blood.. Precise, double vacuum delinting process assures low lint.. USP Type VII: USP means gauze sponge meets United States Pharmacopeial Convention standards.. 4 x 4 inches. There are 10 gauze sponges in a tray and 10 trays in a bag; there are 20 bags in a case for a total of 2,000 gauze sponge.. . WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov