Use for sliding doors and window. 1/4inch x 1/4inch x 19.7 Feet(Bottom Width*Height*Length) Feature: proof dust and noise. Note：Not adhesive backing The middle of the fiber with 2 pieces of pp thin sheet, make it has a better sound insulation effect. It is appropriate choose the fiber length larger than the gap 1-2mm. Groove type install, insert in the groove directly, convenient to use.