Winbag 15730 Air Wedge Alignment Tool, Inflatable Shim Fiber reinforced material, rubber Imported Inflatable air wedge replaces the need for wooden shims and plastic wedges in window, door and cabinet installations Aligns and levels household appliances and furniture Powerful hand pump lifts up to 300lbs per WINBAG Span gaps 3/32 to 2 inches Inflatable air cushion made of fiber reinforced material that is durable yet non-marking