Be different from other acoustic panels,our sound proof foam panels apply high elasticity materials and non-toxic materials to ensure their quality.Our acoustic panels will expand in seconds after you opening the package.It greatly reduce the time of waiting the recovery of the acoustic panels.And they are self-adhesive.that mean you can quick install. Although 1 inch,they remove echo and reduce noise effectively,especially in the application of small and medium-sized rooms.In short,fast expand,high-density,self-adhesive,non-toxic,wide-uses,aesthetics are the reasons for you to choose us.They are affordable!