"Peak Relief Deep Tissue Massage Roller Massage Roller Size: Size: 13” x 5.5” (330mm x 140mm) * Eco-certified EVA foam, SGS passed - 100% raw material, EVA foam * Created by occupational therapists * Unique design with dimpled surface for deeper massage to relieve muscular pain and tightness similar to the thumbs of a massage therapist * Stretches muscles and other soft tissues in multiple directions, breaking down ""knots"" to help increase your flexibility and help relieve back pain * PVC core so it won't lose it's shape * Compact enough to travel with * Great for Pilates, yoga and fitness clinics * Outside : 100% EVA, Inside : 100% PVC, Inner : 100 % EVA"