Package: Seal Ring Gasket Replacement with Lip 2 Pcs. Gaskets Seal Ring Replacement - Blender Replacement Parts Series 600 / 900 - Compatible with NutriBullet Personal Blender 600 Watt and NutriBullet Pro Personal Blender 900 Watt Before replacing the seal ring, make sure you get out the old gasket from the blade first. This is the most common misunderstanding. Please check your seal ring gasket Has the Lip (on Both Sides). Check the dimensions of your blade to be sure. Compatible blade has Outside Diameter - 4.05 inch and Height - 1.57 inch. Dimensions of a gasket installed into a blade: Outside Diameter - 3.9 inch, Inner Diameter - 3.43 inch, Width - 0.235 inch HESSION Gasket Part Rubber Rings Seal Ring Gasket Replacement for Nutribullet Replacement Parts Accessories Blender 900 Series 600W 900W 2 Pack