Muscle Wire R&D KitHere is a quick and economical way to experiment with a wide range of Muscle Wire sizes. Try different projects and test in a variety of conditions.Includes: Muscle Wires Project Book 20cm of the 075 LT Muscle Wire 40cm of the 100 LT Muscle Wire 40cm of the 150 LT Muscle Wires Check out more fun and exciting electronic kits