Package includes: Blender spare parts and accessories - Ring gasket replacement with lip - 6 pieces, small hook - 1 piece Compatibility: Sealing ring replacement - Blender spare parts 600 / 900 series - Compatible with NutriBullet Personal Blender 600 Watt and compatible with NutriBullet Pro Personal Blender 900 Watt Not compatible with: does not fit blades where the gasket does not have a lip. Not compatible with 5 \" diameter NutriBullet RX blades, 3 \" diameter Magic Bullet blades, Baby Bullet blades Warning: Make sure to remove the worn gasket from the blade before replacing the gasket! This is the most common misconception. Please watch the installation video; this is the best way to easily replace it Note: Check if your sealing ring gasket has a lip (on both sides). Check the dimensions of your blade to be sure. The compatible blade has an outer diameter of 4.05 inches and a height of 1.57 inches. Dimensions of a gasket installed in a blade: Outer diameter - 3.9 inches, Inner diameter - 3.43 inches, Width - 0.235 inches