This deluxe set of massage rollers help relieve stress and give you a great relaxing massage and best of all it is powered by the pressure of your hand. If you want a deep tissue massage use more hand pressure. If you want a calm stress relieving light massage then use less pressure. Easy to use and and massages sore shoulders, upper back, arms, legs anywhere on your body. These Massage Rollers are a great way to relieve knots, muscle soreness and promote recovery after workouts while being completely handheld and easy to use and operate. There are no batteries or cords to plug into the wall. Simply take them out of the box and start massaging using the pressure of your hand.