The Trapper Cardboard Tunnel protects glue boards from dust and debris that can shorten the effective life of Trapper Rat Glue Board traps. They are ideal for sensitive accounts where the sight of a trapped or dead rodent could present a problem for the more squeamish. Trapper Cardboard Tunnels present a cleaned up appearance that provides more discretion when you don’t want visitors be aware of a pest control problem. Locking tabs hold glue board securely in place and are easy to assemble. 12 pk.