Premium Quality: Made of high-quality, food-grade silicone rubber. BPA-free, non-toxic, and dishwasher safe. Outside diameter: 4 inches (10 cm), inside diameter: 3.75 inches (9.5 cm), thickness: 6mm. Compatibility: Fits 900W high-speed blenders. Not compatible with Magic Bullet, RX, Baby Bullet, or Ninja Pro 900W. Confirm model before purchasing. Package Includes: 6 x Gaskets Perfect Seal: Durable, elastic gaskets provide a secure seal and long service life. Easy to install and clean. Attention: Designed with a lip for blenders that require it. If too tight, soak in hot water. Wash with soap and water before use. Equust 6-pack Sealing Gaskets Replacement Parts Fits for NutriBullet Blenders 600w/900w Extractor Blade