This is a package of pre-cleaned 72-piece microscope blank slides and 100-piece 22mmx22mm square cover slips
 
Glass blank slides: 1" x 3" x 0.04" (25.4x76. 2x1mm)
 
Glass cover slips: 7/8 x 7/8 x 0.006 inch
 
Material: optical glass
 
Finished with ground edge.