The 3Pack Biggest Cichlid Stones has one each of the three different Large Cichlid Stones:
1 -Large Square                 #6401
1 -Large Toe Hold Rock   # 6423
1 -Large Boulder Rock     # 6413
 
These have the largest openings for hobbiests with the largest fish! Openings from 2 3/4" to 3" tall.
The stones are 7-8" in length.
All are made from Earth Friendly Ceramic - with a single opening for a good defensible hiding, breeding, territory space.