The small size works well with miniature patchwork, doll clothes, and all work that requires holding pieces together in tight sections. 20pc/pack (10 blue/10 red), 50pc/packs an assortment of green, yellow, red, blue and purple. Clip is small and strong, opens wide (8mm) & has a firm grip. The base is flat for easy feeding to the presser foot. Seam allowance markings of 7mm and 12mm.