[PREMIUM QUALITY] Outside diameter: approx. 4 inches/ 10 cm, Inside diameter: approx. 3.75 inches/ 9.5 cm, 6mm thickness, Made of High Quality Silicone, BPA-Free, Non-toxic, Dishwasher Safe.[COMPATIBLE WITH] Fits for Pro 900w high-speed blender/mixer system, NOT Fits for Magic , RX, Baby blenders and Nutri Ninja Pro 900w. Please confirm the model before purchasing.[PERFECT SEAL] The gasket is durable and elastic, providing a good seal and a long service time. Easy installation and cleaning, perfectly match and good choice for direct replacement of original parts.[ATTENTION] 1. Please note that the gaskets are designed with a lip which FITs for blender with a lip, will NOT FIT for blenders which the gasket doesn't have a lip. 2. Please try soaking in hot water if the gasket seems too tight at first. Like any for replacement parts, wash with soap and water before using.Material:Silica gelcolour:greyPackage Contents:6 * Sealing ringOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.