Love2Knit Interchangeable Knitting Needles by Denise Interchangeable Knitting & Crochet These tidy and petite sets come in three size ranges: US 5-9 (3.75-5.5mm), US 10-15 (6-10mm), and US 17 & 19 (12 & 15mm). Each set is packaged in a simple but durable vinyl case and in addition to the needle heads includes: 12", 16", and 24" cords to make 20", 24" and 32" circulars (30cm, 40cm, and 61cm to make 51cm, 61cm, and 81cm circulars) 2 end buttons, and 1 extender for cord-to-cord connections. Love2Knit sets are interchangeable with all Denise products. Case dimensions for US5-9 and US17&19 are 5" x 8.5" x .5". Case dimensions for US10-15: 7.5" x 7.5" x .5". Plastic resin needles are 4”(10cm) long for US5-10 ½/3.75-6.5mm and 4.5”(11cm) for US11-15/8-10mm. Cords are made with a non-phthalate plasticizer - great for teaching children to knit!