The TriggerPoint GRID STK Handheld Foam Roller is a handheld massage roller from TriggerPoint, makers of the revolutionary GRID foam rollers. The STK incorporates a variable surface design similar to the TriggerPoint GRID foam rollers. The GRID foam pattern helps to channel oxygen and blood flow to the muscles, which aids in preparation and recovery. The TriggerPoint STK also features innovative AcuGRIP handles, which, much like a massage therapist’s thumb, are uniquely designed to target specific areas and provide relief to the deep tissue. The STK can be used either seated or standing to roll through tight muscles and knots in soft tissue that can restrict movement and mobility. The TriggerPoint GRID STK Handheld Foam Roller is available in two densities – regular and extra firm – the STK and STK X. Both handheld massage rollers provide portable, on-the-go relief from muscular aches and pains.