Primeline Premium Regular I.D. Band Rubber Tubing 9/16in(14mm), 5/8in(16mm), 18mm

Diameters 9/16in(14mm) O.D. 1/8in I.D. 5/8in(16mm) O.D.  1/8in I.D. 11/16in(17.5mm) O.D.  1/8in I.D. Fresh Rubber - never older than 90 days to guarantee best elasticity. Top Quality Latex provide from an Industry Leader and the most sought after rubber world. Packs a punch! We have done our own comparisons measuring output. Here were our results:  Test 325% Stretch. 12" Rubber, Band Stretch 21.5", 3" Wishbone Rubber Type Band Output (pounds)     Company A - Black 5/8(16mm) 1/8 I.D. 67 lbs Company B - Green 5/8(16mm)1/8 I.D. 55 lbs Primeline - Black 5/8 (16mm) 1/8 I.D. 72 lbs Primeline - Black 11/16(17.5mm) 1/8 I.D. 93 lbs   Note: the Skinny I.D. bands would yeild a higher output since the rubber wall thickness is greater.    For Primeline rubber we recommend a 310% stretch. To calculate the length of bands for your spearguns: measure your speargun band pull average (middle of the muzzle to the middle shark fin), multiply it times 2, subtract 4" (for your stat