🚀 Build, Create, and Innovate with Every Spin! No batteries required—just assemble and play! Take your DIY projects anywhere with this compact set. Crafted from high-quality plastic and metal for lasting fun. Perfect for RC cars, trucks, boats, and helicopters. Transform everyday materials into extraordinary STEM projects! DIY toy compatibility 2mm shaft diameter 50 wheels included The EUDAX 50pcs Plastic Roll and 25Pcs STEM Shaft Round Rod Axles set is an essential toolkit for DIY enthusiasts and young inventors. With 50 durable plastic wheels and 25 metal shafts, this versatile package is designed for creating custom RC vehicles, including cars, trucks, boats, and helicopters. The easy-to-use components require no batteries, making it perfect for on-the-go creativity and learning.