This gasket has a little ridge or a lip.made to lastCompatible with 600W / 900W Extractor blades and Flat milling bladesThese gaskets are meant compatible with those NutriBullet blender with a lip Will not fit NutriBullet blenders where the gasket doesnt have a lip.These Gasket Replacements compatible with NutriBullet 600W 900W blenders fit on either NutriBullet Extractor Blade or NutriBullet Flat Milling Blade, or any of the lids.compatible with NutriBulletBlenders Replacement PartLip compatible with Nutribullet Blendercompatible with Nutribullet BlenderReplacement Partscolour:grayMaterial:plasticsize:Outside diameter :4 inchesInside diameter :3.75 inchesPackage Contents:4 *DURABLE gray gasketPlease note: NOT COMPATIBLE with Nutri Ninja, NutriBullet RX, Magic Bullet or Baby Bullet blenders.Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please dont hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it