Fangrui Product Details Effectively Reduces Unwanted Echoes, Waves, Reverberations, And Tremor Echoes, Making Other Sounds Clearer. It Can Also Be Used As Wall Decoration For Bedroom Soundproofing.each Acoustic Wall Panel Can Cover About 1 Square Feet(12 Pack Covers 12 Square Feet). The Larger The Coverage Area, The Better The Sound Insulation Effect. The Sound Absorbing Panels Are Self-adhesive Backing Designed So You Dont Need To Buy Glue. The Polyester Material Is Easy To Cut And Stick To Surfaces Such As , Doors, Walls, Fabric, Glass. (tips:a Blower You May Need If You Want Lay, Attach, Apply, And Remove The Panels Easily Without Damaging The . Blow The Acoustic Panel With Hot Air Until The Glue Soft And Easy To Remove From The Wall.) Soundproof Panels Are For Spot Treating Sound On Walls In Your Studio Or Office, Recording Studios, Classroom, Bedroom, Offices, Home Studios, And Home Entertainment Theaters. They Are Also Easy To Shape And Cut To Size, Making Them For Use On The Ceiling, Behind The Tv, Or Und