The density of this vibration roller is medium/firm and the slightly softer surface is more comfortable, which helps the muscles relax and results in a deeper massage. It helps to improve flexibility before a workout and speeds up the healing and recovery process after your workout. The textured surface has specifically-designed contours that mimic the hands of a masseuse. The ridges and knobs provide precise points to work out knots in your muscles. It can be used with or without vibration.