From the makers of the original plastic snow guards. SnoBlox polycarbonate clear plastic snow and ice guards are only manufactured from virgin grade, UV-stable, polycarbonate. These guards are made with the same bulletproof resin material that is used on the astronaut’s face masks. The SnoBlox Deuce snow guards help minimize the dangers of sliding snow and ice by suspending it in a holding field on the roof. This kit is for 25 snow guards only and does not include fasteners or sealant. Placement of snow guards in isolated areas such as chimneys, doorways, vents, and partial roof sections is NOT recommended. Strong, Durable Design A flat, forward-facing design is proven to cause less roof stress, failures, and leaks than other competing options. Triple Strength Waffle Base Each snow guard holds 3,456 pounds when attached with screws and 1,379 pounds when attached with our recommended adhesive. This is nearly triple the strength of smooth bottom guards of the same size. SureBond SB-190 is the Industry Standard For Snow Guards Attach To Your Roof Without Penetrations. For a successful installation the adhesive requires 28 days or (672 Hours) at 50 Degrees (F) or above to achieve full cure. (Not Included with this listing) Simple Glue-Down Installation The mounting versatility of this product allows it to be adhesive mounted to screw down roofs with at least a 1.5" flat area or on floating standing seam roof systems. (Not Included with this listing)