Heathrow Scientific HD159874B Ground Edge Blue Frost Color-Frost Premium Microscope Slide with 90 Degree Corner, 3" Length x 1" Width, 1-1.2mm Thick (Pack of 50) 1 x 3" glass microscope slide with one colored frosted glass end for labeling 1.0 to 1.2mm slide thickness Ground edges and corners for safe handling Washed, rinsed, and dried dust-free for immediate use Wrapped in cellophane to seal out moisture