How can slingshots not hurt rubber bands?

For traditional bows, a rubber band (troublesome but useful) can be put on the rubber band that contacts the bow door, because the outer layer protects the inner rubber band.

Or take the bow to wash the stone, as many archers do. My bow is washed with stone, and the effect is very good.

If the ball bow is stuck, it is necessary to polish the bow eye and remove all chamfers. It is best to put a layer of rubber band on the rubber band of the card ball (that is, the section near the bow door).

I finally called so many, I hope to adopt them. thank you