Protect your fish from predators, including The Great Blue Heron and other fish diving birds. Also protects pond fish & koi form too much sun in a foliage-bare pond. The kastle made of a fish-safe aluminum frame and black 1/4" black mesh sits on the bottom of your pond giving your fish a great hiding place. It is self weighted, so there is no addition work in securing the Koi Kastle. 12"x 24" Durable Aluminum Frame This product will give your fish a place to hide and make them feel more comfortable, which will in turn make them happy. nykkk02 Most Orders Shipped Out Same Day! Premier Ponds LLC pondinfo@premierponds.com U.S.A. Copyright © 1999 - 2007 Premier Ponds LLC, North Salem, New York. All rights reserved. Thermo-Pond Heater 3.0, Aquascape Designs Pond Kits, ScareCrow Sprinkler, Nursery Pro Micro Pond Kits, AquaClearer, Microbe-Lift, Great Blue Heron Decoy, Pond Liners, Thermo Pond Heater & Deicer, Premium Koi Food, Select Koi, Butterfly Koi, Pond Aeration Pumps, Flexible PVC Piping, BioFalls, Skimmer, Aquascape Pumps, Cat Stop!, Animal Control Products, Pond Netting.