Rinzl Plastic Cover Slips, 22mm. Made of unbreakable, clear vinyl plastic. Refractive index as glass, but won't cut skin. Use in biological, medical and educational labs. Perfect for young children and field applications such a veterinary work, and more. 100 ct per individual paperboard box, 10 boxes per case, 100 coverslips total. Made in America. MPN 20 40 5301. SKU 2085US.