Designed for use with FLEX Double Pointed Needles or to build your own DPN set from Sharp Short Tips (or standard length needle tips - measurements below are for Sharp Short Tips). Each set includes three cords. 2 inch (5 cm) cords create FLEX DPNs that are 7.5 inches (19 cm) long for US 5/3.75mm-10/6mm and 8.5 inches (22 cm) long for US 10.5/6.5mm-15/10mm. Also excellent for building a very short 6 5/8 inches (12 cm)Tunisian crochet hook. 3 inch (8 cm) cords create FLEX DPNs that are 8.5 inches (22 cm) long for US 5/3.75mm-10/6mm and 9.5 inches (24 cm) long for US 10.5/6.5mm-15/10mm. With a crochet hook head, this length makes a 7 5/8 inch (19 cm) Tunisian crochet hook. 5 inch (13 cm) cords create FLEX DPNs that are 10.5 inches (27 cm) long for US 5/3.75mm-10/6mm and 11.5 inches (29 cm) long for US 10.5/6.5mm-15/10mm. With a crochet hook head, this length makes a 9 5/8 inch (30 cm) Tunisian crochet hook. Interchangeable with all Denise products and made in the USA.