There are several types of glass coverslips available, categorized based on their thickness and size. The most common thicknesses are No. 1 (0.13-0.16 mm) and No. 1.5 (0.16-0.19 mm), with No. 1.5 being preferred for high-resolution imaging techniques. The dimensions of coverslips typically range from 18x18 mm to 24x60 mm, allowing for flexibility depending on the size of the specimen.