Help release muscle tension in the body and soothe tired feet with this 2-piece Spiky Massage Ball Rollers Set featuring textured balls made of flexible plastic with spiky surfaces. Balls measure approximately 3.5" in diameter. Come packaged in an individual box. Box measures approximately 3.75" x 3.75" x 7". Helps release the muscle tension Textured spiky surface that comfortably massages 3.5 Diameter Helps tired feet and other common discomforts Easy to use.