Sieral Aquarium Lids Polycarbonate Canopy 2 Pieces Set 22.95 x 11.5 x 0.12 inch for 33/40/55 Gallon with Center Brace Aquariums Cover Fish Tank Lid with a Hook Knife, ClearBrand: Sieral Color: Clear Features: Functional Material and Design: enjoy the flexibility of the aquarium lid made from polycarbonate, a material that is less fragile and lighter than glass, not easy to deform, the clear color provides transparency for easy observation and lighting within the fish tank, remember to tear the film for optimal clarity, Please measure your tank opening to the closest millimeter before purchasing Detailed Packaging: the