This tray is a cost effective propagation tray with a good height clear dome for cuttings.
These "inexpensive" propagators were initially thought to appear flimsy and cracked, perhaps intended for single use only. In fact, these propagators are well made and sturdy. The only thing that could be described as "cheap" is the price.
The size of approximately 35 x 21 x 12 cm is very useful and comfortably holds a tray of 24 Rockwool or Root Riot cubes. The quality is good enough to allow reuse many times.