✅ Made of good quality metal with silicone grease. ✅ Compatible with Xiaomi M365, Essential, 1S, Pro, Pro2 version of electric scooters. ✅ Package contents: 2x bearings ✅ We love this product and quality, and we're sure you will too. However, if you don't, no worries! Just sent it back for a full refund. It's quality with a guarantee.