The Trigger Point Grid 1.0 Foam Roller, the original hollow core roller, features a patented multi-density foam surface that provides firm compression like a sports massageKey FeaturesIdeal for both beginners to advanced rollers3D surface allows tissue to aerate as you roll, promoting blood and oxygen flow - the nutrients needed for muscle repairProprietary dystrophy zones replicate the feel of a massage therapist's handsHard, hollow core hand-wrapped with EVA foam makes it firmer than traditional foam rollersSuperior construction will not break with repeated useMore DetailsSize: 33cm