- Set of 10 compression springs made of 304 stainless steel, measurements: 0.5mm wire diameter, 4mm outer diameter, and 40mm length - Offer high elasticity, rust and corrosion resistance, ideal for demanding applications - Smooth surface that facilitates assembly and reduces wear during use - Easy installation with common tools, suitable for both professional and hobby users - Recommended for use in repairs, maintenance, electronics, pens, toys, 3D printers, and DIY projects - Long service life and reusable, maintain their performance after multiple compression cycles - Check the diameter and length before purchase to ensure compatibility with your project