15 ml disposable sample cups with airtight lids. Diameter is 1.53 inches, height is .447, and wall thickness is .027. Used in the AquaLab Series 4 (4TE, 4TEV, 4 DUO), Series 3 (all versions), CX-2, WP4, WP4C, Pawkit, AquaLab Lite, and AquaSorp IG.
In boxes of 500 with lids or 500 without lids. Order online here.