Excellent heavy duty 10 well slide (2 rows 5 wells/row) made of molded pressed glass. Wells have concave bottoms, are 1 cm in diameter and hold 0.15 to 0.20 ml each. Slide is 108 mm L x 57 mm W and 4.5 mm thick. Excellent for dividing samples of rotifers or other zooplankton for counting population densities. Can be used with a 10X magnifier or dissecting microscope.