Velda Heron Stop Bird Tripwire with Bells By stretching a nylon wire along the pond side, which is invisible for herons, the access to the pond will be blocked. The ringing noise of the little bells will prevent a heron from making another attempt. The Heron Stop can be applied simply and nearly invisibly. The length of the wire is sufficient to protect ponds with a circumference of 12.5 metres. The set contains 8 rods, 25 metres of nylon wire, 8 jingle bells. Specifications Suitable for 12.5 metres Contains 8 rods, 25 metres of nylon wire, and 8 jingle bells Features Blocks access to ponds with a nylon wire that is invisible to herons, and scares them away with jiggling bells The length of the wire is sufficient to protect ponds with a circumference of 12.5 metres.