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 blender with a lip Will not fit blenders where the gasket doesn't have a lip.These Gasket Replacements for 600W 900W blenders fit on either Extractor Blade or Flat Milling Blade, or any of the lids.for Blenders Replacement PartLip for Blenderfor BlenderReplacement Partscolour:grayMaterial:plasticsize:Outside diameter :4 inchesInside diameter :3.75 inchesPackage Contents:4 *DURABLE gray gasketPlease note: NOT COMPATIBLE with Nutri Ninja, RX, Magic or Baby blenders.Only the above package content, other products are not included.Note: Light 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.