100% polyester. Sheer for use with any color fabric and any weight fabric. Tape is 5/8" wide rings are 5/8" wide. Basic by-the-yard tapes for the construction of window treatments. These tapes make construction of drapery easy as the shirring and gathering work is eliminated. Put-ups are smaller than "workroom" put-ups and on very manageable size spools. All spools feature graphics which show the tape in use.