Steam-A-Seam 2 Double Stick has the pressure sensitive on both sides which allows for a temporary hold to both the appliqué material and the background material. You can hold your project vertically and the appliqué pieces stay in place and are still repositionable until fused with an iron. Once fused, Steam-A-Seam is washable and dry-cleanable. Unfinished edges won't lift or fray. (the manufacturer does not recommend drying with a dryer sheet) Bond is strong and permanent. Will not gum up your needle. 1/2" x 20 yard roll.