Marineland Perfecto Glass Canopy 28 Euro Canopy is 23" long x 11.75" from front to back. This canopy has a polypropylene hinge for enduring service; excellent for either salt or fresh water; plastic backstirp adapts to all accessories; greatly reduces evaporation; keeps fish from jumping out; protects light from moisture; all glass edges seamed for safety; easy one hand operation to feed fish.