This gasket has a little ridge a lip.made to lastCompatible with 600W / 900W Extract blades Flat milling bladesThese gaskets are meant f those NutriBullet blender with a lip Will not fit NutriBullet blenders where the gasket doesn't have a lip.These Gasket Replacements f NutriBullet 600W 900W blenders fit on either NutriBullet Extract Blade NutriBullet Flat Milling Blade, any of the lids.f NutriBulletBlenders Replacement PartLip f Nutribullet Blenderf 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 Baby Bullet blenders.Only the above package content, other products are not included.Note: Light shooting different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.