Block to Block "Blankie"
Because the Block to Block board is a solid, flannel covered board that your fabrics will adhere to, it doesn't allow pins to penetrate. The "Blankie" is designed to slip over the upper corners of the Block to Block. With the Blankie you can now pin anything you want to the "Blankie" and get the advantages of the Block to Block. You can pin your block pieces, paper piecing pieces, heavier fabrics, audition multiple layers of fabric, and anything else that you might think of. Now you have the best of both worlds.