This is an artificial pupation chamber purchased about two years ago. The plastic cups are 430cc size. The sponge inside shows some discoloration from storage, but it is new. The depth is approximately 3cm to 3.5cm at the deepest point. The lids of the plastic cups have 2-3 ventilation holes. This is a set of two. For reference... I have used these to successfully hatch small foreign rhinoceros beetles, male rainbow stag beetles, and female large stag beetles. Please note that these cannot be used for large rhinoceros beetles or male large stag beetles.