Replacement cups for the Prevue Model 123 and 125 Cockatiel and Parrot cages. Slide in dishes are made of non-toxic high impact hard plastic. Measurements for these cups are as follows: across the back part of the cup which includes the "wings" which actually hold the cup in place in the cage is 4-1/2 inches wide; the cup itself is just over 3-1/2 inches wide and from the back of the cup to the front is 2-1/2 inches. The cup itself is slightly over 1-1/2 inches deep. These dishes are specifically sized for the Prevue cages and may not fit any other brand of cage.