Safe material and proper size: the gasket is made of rubber material which not only has nice sealing and fine elasticity but also doesn¡¯t contain BPA, safe for you to use; The outside diameter of this gasket is approx. 3.7 inches, the inside diameter is approx. 3.3 inches, you can judge whether the size is proper for your blender[Blender Gasket Packing] Seal Ring Gasket Pack of 4. [Replacement for Nutribullet Gasket COMPATIBLE]: Replacement for Nutribullet 600/900 Series.[Blender Gasket Replacement Notice] This gasket is NOT a Replacement for Magic Bullet, Nutribullet Lean, Nutri Bullet RX, Baby bullet, NutriBullet Model Nr. NB 101B/ NB 1018 Model series.[ Blender Gasket Replacement Old Item] Nonoriginal products, Any reference to brand or model numbers is intended for identification purposes only. This product does not include any warranty from the manufacturer. This blade should be hand-washed after use. Made by Premium Quality food-grade rubber, superior toughness, not easy to deformation, convenient to clean.[ Blender Gasket Service Gurantee] These Blender Gasket come complete with a 3-Month warranty. Our department Usually does a 100% quality inspection on the Blender Gasket before delivery. We will refund if the Blender Gasket is defective. If you have any problems, feel free to contact us.