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 ThinIt 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. which allows it to be more easily wedged into gaps without too much force. Easy to UseSimple tools with simple squeeze pump and precision bleed valve allow for raising and lowering for perfect alignments, safely handles full size installations with only one 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. Wide-Range ApplicationOur mounting pads are great for various tasks and applications, lifting and lowering, to achieve perfect alignment. Suitable for window and door installers, interior workshop, installers of appliances and small equipment, other experienced craftsmen, such as appliances, beams, cabinets, doors, appliances, furniture, air conditioning, plumbing, wooden beams and more.