Compatible with the NutriBullet 600W and NutriBullet Pro 900 High-Speed Blender System Made by Premium Quality food-grade plastic. Dishwasher safe. Screw Off Comfort Lip Ring NOT compatible with MB1001 MB1001 and NOT compatible with Nutribullet RX Fit for Nutribullet 600/900/1000/1200W Series. This is a must-have accessory for your Nutribullet. It makes your drinking more enjoyable and convenient. This pack of comfort lip ring is perfect for sharing with friends and family. It's easy to install and remove, and it's dishwasher safe.