Made of Copper, the LYKKE Cypra needles are very smooth and light. This Interchangeable Set includes 12 pairs of 5" Needle Tips including Sizes US 3, 4, 5, 6, 7, 8, 9, 10,10.5, 11, 13, and 15. Also includes 2 cords for 24" length, 2 cords for 32" length, and 1 cord for 40" length, 2 connectors, 4 keys, and 8 stoppers.