This gasket has a small ridge or lip. Durable Compatible with 600W / 900W extraction inserts and flat milling inserts These washers are suitable for NutriBullet mixers with a lip. Not suitable for washers NutriBullet mixers without a lip. These gasket replacements for NutriBullet 600W 900W Mixers are suitable for NutriBullet Extraction Blades or NutriBullet Flat Milling Blades or any cover. Replacement Parts for NutriBulletBlenders Lips for Nutribullet Blenders Replacement Parts for Nutribullet Blenders color: grey Material: Plastic Dimensions: Outer Diameter: 4 inches Inside Diameter: 3.75 inches Package Contents: 4 * Durable Grey Washers Please Note: Not Compatible with Nutri Ninja, NutriBullet RX, Magic Bullet or Baby Bullet Blenders. Only the above package contents, excluding other products. Note: Light shooting and different monitors may cause the color of the item to be slightly different from the actual item. Measurement tolerance is +/- 1-3 cm.