The Z Poolform™ BPL-004 8' Bullnose Form Liner is a flexible rubber insert that is grooved at the top in order to lock firmly into the compatible back piece. This form liner is interchangeable with others in the collection to give you a selection of different edge profiles and textures to tie in with your hardscape design. These popular textured edges match most deck stamps on the market and eliminate extra work to create a seamless appearance.