Choose from two thicknesses: no. 1 (0.13 to 0.17 mm) or no.1.5 (0.16 to 0.19 mm). Cover glasses are made from borosilicate glasses and packaged by the ounce. The cover slips feature extra-white soda-lime glass with very low iron content.

Cover glasses are made from borosilicate glass. Square cover glass is 22 x 22 mm with a thickness of #1.5 (0.16 to 0.19 mm). Cover glasses are packaged by the ounce; quantity in a box is approximate 138/Pk.