Dukal, USP Type VII X-Ray Detectable Gauze Sponge, Box Of 100Product Description USP Type VII gauze, 100% woven cotton Blue filament runs through each sponge and has a unique wave pattern to ensure easy x ray detection Both sterile and non sterile sponges are banded in 10s to ensure accurate count Product Benefits Ingredients Suggestions Special Note Warnings California Proposition 65 WARNING Some products on this website contains progesterone, a chemical known to the State of California to cause cancer.