Sieral Aquarium Polycarbonate Canopy Set 19.37 x 9.37 x 0.12 Inch for 10/20 Gallon Without Center Brace Aquariums Cover Fish Tank Lid with a Hook Knife, ClearBrand: Sieral Color: clear Features: Material Superiority: this aquarium cover is manufactured out of robust polycarbonate material, which is not prone to cracking, this material ensures the product's longevity and reliability, hence it can be applied for an extended period; Please measure your tank opening to the closest millimeter before purchasing Transparency: designed in a clear white color, the aquarium cover boasts remarkable transparency; The