It's Sew Emma Cross Stitch Finishing Tape makes mounting your needlework projects a breeze! This double-sided, acid-free tape adheres to art boards, foam core and more without leaving residue on your fabrics and without needing pins, staples, glue or clips. Get a professional finish on every project every time, the perfect hassle- and worry-free way to show off your work. It is Acid free and double sided.