SPRI Foam Roller High Density Extra Firm Muscle Massage Roller (Available in 12, 18, 36-Inch Lengths) HIGH DENSITY FOAM ROLLER: Ultra rigid foam roller provides maximum firmness for an extra tough and firm massage BUILT FOR REPEATED USE: Foam roller maintains shape after repeated use and is built to a professional grade quality and designed for commercial gyms and clubs to be used 100 times a day versus 100 times a year in a home gym IMPROVE CORE STRENGTH: Perfect for developing core stabilization, lower body balance and stamina MUSCLE MASSAGE RELIEF: May also be used for gentle stretching and self-mobilization of joints and spine MASSAGE GUIDE INCLUDED: A downloadable massage guide is included to help get you started!