Package Include: Blender Replacement Parts and Accessories - Seal Ring Gasket Replacement with Lip - 3 Pcs. High quality silicone, BPA Free Compatibility: Seal Ring Gaskets Replacement - Blender Replacement Parts Series 600 / 900 - Compatible with NutriBullet Personal Blender 600 Watt and Compatible with NutriBullet Pro Personal Blender 900 Watt Warning: Before replacing the gasket, make sure you get out the worn gasket from the blade! This is the most common misunderstanding. Please watch the installation video; this is the best way to replace easily Pay Attention: Please check that 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 Not Compatible with: These gaskets are meant for blender blades where the gasket Has the Lip. Will not fit the blades where the gasket doesn't have a lip. Not Compatible with Nutri Bullet RX blades 5" diameter. Not Compatible with Magic Bullet blades 3" diameter. Not Compatible with Baby Bullet blades.100% Consumer Satisfaction: For any reason you're not completely satisfied, please do not hesitate to contact us for a replacement or full refund