From Slingshots.UK a newly designed Ultra Arrow Band Set, specifically for firing Arrows made from dual embedded 3060 (6mm) bands

The stretch on the Ultra Arrow Band exactly matches the TEMPEST slingshot when it is not extended, which is 60cm (600mm).

AND, you can twist these bands together to form 4 or 6 band sets!!!

The Complete Slingshot Set includes the complete slingshot, with flat, round and arrow bands!!!