PATENTED DESIGN that offers a superior, multi-density exterior constructed over to deliver firm compression on tight muscles, knots, and kinks, over a hollow core that won't break down or lose shape from repeated use 3.5-INCH DIAMETER ROLLER provides less surface area while delivering targeted relief to deep layers of tissue TRUSTED foam roller of physical and massage therapists, coaches, trainers and athletes for all levels of athletes 2.6-INCH DIAMETER BALL ideal for targeting small muscles such as calves, piriformis, lower back, forearm, pecs, and more INCLUDES ACCESS to free online instructional video library on using both products with best practices from the experts at Trigger Point