TRUBALL STINGER JR RELEASE W/V TruBall® Stinger Jr. Caliper Bow Release TRU -BALL $44 .99 TruBall ® Stinger Jr. Caliper Bow Release 0 0 TruBall ® Stinger Caliper Bow Releases. Smooth, crisp, adjustable... and totally affordable ! TruBall ® Stinger Jr. Caliper Bow Release Top quality, with easy-to-adjustable draw length. Strong teflon-coated aluminum jaws for more speed, less string wear. Silent, smooth, self-closing jaws for easy loading. Deluxe padded wrist strap for comfort. Available in 3 sizes.