The spikes on the reel are pronounced, comfortable and effective, which is perfect for relieving tension, increasing blood circulation and relieving muscle tension The roller is well made and rolls smoothly, made safe, non-toxic, no chemical odor, washable and durable TPR and PVC material, does not feel sharp on the skin Hands free, it is much easier to use than a ball-type massager, just in tense or painful places to roll slowly and purposefully With a length of 17cm and a diameter of 7cm, very comfortable to carry when you go to the office or hike, etc. Suitable for from youth to senior, long distance running, ballet, teachers, field workers, athletes, children, runners, athletes, dance aerobics, etc. Product Material: PVC + TPR Body area: full body size: (L) X (W) 16.8X8cm / 6.61''X3.14 '' (approx) Features new and high quality. Shaped to complement the soles of the feet. This role makes it safe for any type of flooring the foot massage roller delivers the same therapeutic effects of a deep tissue massage Numerous knobs on the surface of the roller create a kneading effect to promote blood circulation and relieve pain