This white cleanroom packaged foam is comprised of fully reticulated (open celled) polyester-urethane. It is absorbent to solvents and is non abrasive. The foam is especially low in particle generation and resists hydrocarbons, oils, solvents, and grease. The Sponge is 6" x 9" Packaged 100 sponges per bag. 5 Bags per Case. Sold by case only.