Fangrui Product Details Sound Absorbing Foam Boards Can Be Used As Sound Insulation Covers For Walls, Ceilings And Doors, As Long As They Are Fixed With Staples, Nails, Screws, Tacks, Double-sided Tape Or Glue. (excluding Adhesives) This Acoustic Foam Panels Is Designed As Unique Triangle, Which Can Not Only Absorb Unnecessary Sound, But Also Play A Role In Decorating The Wall Surface. Easy To Shape And Cut To Size, Altering Wont Affect Performance. The Soundproofing Board Is Made Of High-density Polyurethane Material And Flame-retardant Environmental Protection Material, With Good Soundproofing Effect. The Use Of Fireproof Materials Ensures Practical Safety And Is A Safe And Reliable Product. This Sound Dampening Foam Panels Can Be Use To Spot Treat A Professional Or Home Recording Studio, Commercial Or Home Office, Rehearsal Space, Or Home Theatre, And Which Are Great For Recording Studios, Vocal Booths, Control Rooms, Also Ideal For Home Theaters, Professional Movie Theaters, Concert Halls And More. Note: When Using The Sticker, Please Make Sure That The Wall Is Flat And Free Of Powder And Other Foreign Matter, Which Will Affect The Adhesive Effect. If Your Walls Are Rough, We Recommend Using Acoustic Foam Spray Glue.