Pond Filter Media 12" Wide X 3 Feet Long X 1.5" Thick Fish/lobster/koi Ideal for many water applications including wet or dry Koi ponds, Fish ponds,watergardens, reuseable Minnow tanks,Lobster tanks, fish and plant safe. reef tanks also Plyable not coarse. Fine filtration Bonded filter media. Durable will not rip like others