Trumark Powerbands Heavy Pull Packaged straight for true flight Easily installed Surgical grade latex Matched grade tube All Trumark slingshots are powered bysurgicaltubing. The tubing isattachedtotheleather pouch with light-weight, hollow,pin connectors The RR-2 has a considerably heavy pull. The advantage of the heavier pull bands is that it will shoot the larger 3/8" ammo farther than normal-pull bands so there is more impact when the ammo strikes the target A0.4%carbonblackjacket has been added to therubberfor the ultimateprotection againstdamaging Ulraviolet lightrays. The black carbon helps make them the most durable slingshot bands ever Bothleft and right bandsarecutfromone length of tubing sotheyare "matched"(balanced)foraccurate shooting