TriggerPoint Grid Foam Roller with Free Online Instructional Videos, Original Foam Imported Patented foam roller design offersa superior, multi-density exterior constructed over a rigid, hollow core Constructed from quality materials that wont break down or lose shape from repeated use Includes access to free online instructional video library on foam rolling best practices from the experts at TriggerPoint Trusted foam roller of physical and massage therapists, coaches, trainers and athletesprovides muscle recovery, pain relief and improved flexibility OriginalGRID: Standard density, 13 x 5.5 inches, 500 pound weight limit; 1 year manufacturer's warranty