The Air Cushions Is Made Of Thick Tpu Material, Which Is Very Durable And Hard To Wear. The Valve Is Completely Sealed, Will Not Leak, And Can Be Used Repeatedly The Airbag Is Very Flat, With A Thickness Of Only 1.5 Mm, And Can Be Easily Pushed Into A Small Space. Without Load, The Cushion Can Be Inflated To A Maximum Thickness Of Approximately 7 Cm. Air Pump With A Hand Pump And A Check Valve, Pumping And Deflating Is Effortless, And You Can Deflate The Air Again To Adjust The Appropriate Height By Pressing The Button The Size Of The Mounting Pad Is 16*15Cm, One Person Can Easily Lift Heavy Objects, Which Provides Great Convenience For Installation Work. For Lifting, Aligning, Moving, Fixing, Etc. Ideal For Do-It-Yourselfers, Also Very Suitable For Door And Window Fitters, Indispensable For Installing Windows, Shutters, Even Heavy Doors