Plastic Roof Ice Guard Mini Snow Guard (100 Pack)Prevent Sliding Snow Ice Buildup-Acrylic Stop snow from sliding off your roof. Prevent law suits and injuries Width: 1.5 Inches Length: 4 Inches Height: 2 Inches Please use a silicone sealant around the base of the guard in order to provide a water tight leak free seal. 100 Pack Plastic Clear Roof Guards