This gasket has a little ridge or a lip.Made to lastCompatible with 600W / 900W Extractor blades and Flat milling bladesThese gaskets are meant for those for NutriBullet blender with a lip Will not fit for NutriBullet blenders where the gasket doesn't have a lip.These Gasket Replacements for NutriBullet 600W 900W blenders fit on either for NutriBullet Extractor Blade or for NutriBullet Flat Milling Blade, or any of the lids.Colour:grayMaterial:plasticSize:Outer diameter: 9.3CM, inner diameter: 8CMPackage Contents:8 * DURABLE gray gasketOnly 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.