The disclosure teaches an improved projectile throwing sling of the type having a pocket and two thongs wherein a supple pocket is provided to provide gripping power pending the throw and wherein at least one weight is carried by the sling at the release end of the pocket. A weight which simultaneously fastens the release thong to the release end of the pocket is taught and matched weight disposed at each end of the pocket and adapted to simultaneously fasten the release and tether thongs to the two ends of the pocket are also taught.