This gasket has a small ridge or lip. Made to last. Compatible with 600W / 900W extractor blades and flat milling blades. These gaskets are intended for NutriBullet blenders with a lip. Does not fit NutriBullet blenders where the gasket does not have a lip. These gasket replacements for NutriBullet 600W 900W blenders fit either on the NutriBullet Extractor Blade or NutriBullet Flat Milling Blade, or any of the lids. For NutriBulletBlenders Replacement PartLip for Nutribullet Blenderfor Nutribullet BlenderReplacement PartsColor: GreyMaterial: PlasticSize: Outer diameter: 4 inchesInner diameter: 3.75 inchesPackage contents: 4 * DURABLE grey gasketsPlease 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 +/- 1-3 cm.