It is the 3M scotch tape, double side, but the instructor was very specific to say that it was the red plaid label. He pins the quilt, but does the tape right on the seams, but not where he is stitching. When he is done, he removes the tape. I took the Bird of Paradise paper piecing class from him. Amazing.......some of the pieces of fabric when we were done were no more than 1/8 of an inch.