Spike design as the massage balls to promote recovery of sore, tight, and tired muscles, but these are in the shape of a peanut. This shape contours to the body's form and covers a wider area. 5.5 Inches Long and 3 Inches in Diameter. Pointed spikes penetrate deep into tired aching muscles to effectively stimulate blood flow and reduce muscular pain and discomfort. Comfortable and easy to grip peanut shaped spiky massage roller is portable and compact enough to take anywhere. Easy to clean and store.