RT/2013R 2" Black rock tape, An American developed, Korean made product consisting of flexible cotton fibers and acrylic adhesive that provides the support, stimulation and resiliency necessary for performance enhancement. features: 190% elasticity, a higher tensile strength than other kinesio-type tapes A patent-pending plow pattern Stronger adhesive Tighter weave These characteristics have made Rocktape the product of choice for athletes who participate in endurance sports such as cycling, running, swimming and rock climbing, to name just a few.