Our blade is made of stainless steel, sharp enough to crush ice, and the jar base cap is made of hard plastic, not easy to break, and o-ring gaskets are made of rubber, soft and durable. Compatible for 5 and 6 cup glass or plastic jars, kit for blender. The blender motor alternates the blades forward and backward, drawing food and ice down for consistently blending. 4902 Jar Base Cap: The jar base cap is compatible For most blender jars. However, it does to the blstmb-cbg-000 Pro 1200 mixer. Please make the models, easy to install, no other tools needed. O-Ring Gasket Seal: The gasket is installed at the bottom of the blender blade plate and is compatible with most kitchen centers except Pro 1200, and will not take too much time to complete the installation. 4961-011 Ice Blade: Compatible with most 5 and 6 cup glass or plastic jars, 4 blade design can cut things , bring convenience to your kitchen. 4902 Jar Base Cap: Compatible with most blender jars except blstmb-cbg-000 Pro 1200 blender, made of hard plastic, durable and safe.The blender motor alternates the blades forward and backward, drawing food and ice down for consistently blending. O-ring Gasket Seal: Compatible with most kitchen centers except Pro 1200, made of rubber material, fit the base of blender blade plate. colour: silver + black Material: plastic+rubber+stainless steel Package Contents: 1 x Crush 4 Blade 1 x 4902 Jar base cap 2 x Sealing ring gaskets Only the above package content, other products are not included. Note: Light 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.