Platinum Fitness Ridgeback Foam Roller Pro for Trigger Points and Massage More comfortable for Use on backs than old-style 13" wide models Ridge grid contoured foam surface developed by a leading registered massage therapist to mimic a therapists Healing hands and fingers Ridgeback rollers are constructed with a unique and proprietary seamless core technology Designed and manufactured to an industry leading maximum weight capacity of 400 lbs Larger diameter of 5.5" compared to regular 5" diameter models for better Control and effectiveness