Today, a fellow double bassist, sent me this 'finger bow' :
What is the purpose of such a thing?
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The “Finger Bow” allows the player to instantly switch between finger style (pizzicato), and bowing (arco) with a flick of a finger. The bow is 10 3/8” long, and made of lightweight and resonate poplar wood. It is not intended to replace a traditional longer bow but to be a new tool for creative expression.
Just an easier way to switch between finger style and bowing.