Oster 4937 Mini Jar Accessory Do you grind your coffee beans or baby food in your blender, but hate to because you don't want to clean up the whole jar just for a little amount Oster has the accessory for you. Just put your ingredients in the 8 oz mini jar, place the blade assembly and blend your ingredients right top of the blender. If you still have an excess amount in the jar, a lid is included for storing.