This vibrating rubber comes between the motor housing and the jar.It is a replacement part for the below units, but in theory also fits units that do not come with a wear strip. Blendtec Professional 750 Blendtec Professional 800 Blendtec Q-Series Blendtec Smoother Blendtec ABC Blendtec 825 Connoisseur Blendtec 825 Space Saver Blendtec Stealth 875 Blendtec Stealth 885 Blendtec Stealth 895Also suitable for older Blendtec models which are not listed.