The KitchenAid Artisan K400 Blender Tamper is a useful accessory to have when making ultra-thick blends such as nut butter or hummus. Using the BPA-free tamper helps to process the blend, pushing thicker ingredients into the vortex and eliminating air pockets which can sometimes occur. The KitchenAid K400 blender tamper is dishwasher safe and is supplied with a 2 year KitchenAid guarantee.