These amazing massage domes provide stimulating relief for tires aching muscles without the use of batteries, electricity or complicated procedures. Specially-designed nodules penetrate muscle mass to help soothe away nagging pain, relieve stress and increase blood circulation. Set of two domes made of durable man-made materials, can be used together or individually, from a seated, prone or standing position...the combinations are endless. 6 1/2” diameter each.