The Rehab Roller is a foam roller and multipurpose home therapy system, all in an 18 inch length and 6 inch diameter. It contains about 10 inches of space for pure foam rolling, which is more than most people will need. It also has about 8 inches of space on the ramp to accommodate large feet and hands for calf and wrist stretching.  The finger holes on the roller are designed to fit 95-97% of people’s fingers, as they are designed to suit average sizes using Da Vinci measurement proportions. If your fingers are slightly larger, you will stretch the foam as you put your fingers in, and if your fingers are slightly smaller, you will be able to put them in deeper and leverage them against the walls of the hole, so one size will fit most. Some foam rollers are used sideways to massage the paraspinals, but with the grooves and contours of the Rehab Roller’s paraspinal divet, there is no need to place the RehabRoller longitudinally, but you can do that as well, if you’d like.