[Heavy Duty & Safe] Double-sided TPU molding design for higher stress with higher abrasion performance. Superior compressive strength to lift up to 220 lbs. There are two air wedges in this set. By using two together, you can lift things up to 440 lbs, and you can lift them more stably and safely. [Super Thin] It deflates, like a balloon, at the push of a button. When fully deflated, it is only 1.5mm thick, the air wedge easy to insert into the small space, more application possibilities and storage convenience. allowing it to be wedged into gaps more easily without too much force. A versatile tool can be used as a wooden shim or wedge, sometimes a pry bar or lever, for windows, doors and cabinets installations, replacing damaging pry bars and wood washers, and auto repair tools. Simple tools with simple squeeze pump and precision bleed valve allow raising and lowering for perfect alignments, safely handles full-size installations with just a single installer; Effectively save your assembly time and labor [To be used again and again!] It is made of flexible resin, It is durable, No-scuff cover sheets on markers, can be used repeatedly