Strong, plastic hexagonal grids interlock together quickly and easily to protect fish from cats, herons and other predators. The grids float on the surface of the pond and are virtually undetectable from a short distance. No need to cover the whole pond. Includes 80 clips to attach to squares for an extra-secure fit. Strong, plastic hexagonal grids interlock together quickly and easily to protect fish from cats, herons and other predators. The grids float on the surface of the pond and are virtually undetectable from a short distance. No need to cover the whole pond. Includes 80 clips to attach to squares for an extra-secure fit.