Bird B Gone MMPOND-12 Defender Pond Fish Protector Bird B Gone Pond Defender is a system of interlocking UV protected plastic discs that create a shelter for pond fish against predators; 12 per pack Virtually invisible from just a few feet away Pond Defender disks interlock to each other in seconds to fit the shape of any pond; plants will frow through Pond Defender openings Bird B Gone Pond Defender disks are easy to interlock using the supplied clips and disks can be easily removed for cleaning and pond maintenance Pond Defender disks are less obtrusive than traditional pond surface netting