Thank you for viewing. This is a pair of Wenwan walnuts (grinding disc type). The size is approximately 38mm. The left and right sides are similar in size and shape, and they fit comfortably in the hand. Playing with them by rolling them in your palm is good for relaxation, a change of pace, and exercise for your fingertips. Health benefits (grip balls): Playing with them by rolling them in your hand is said to stimulate the acupressure points in your palm, promoting blood circulation, relaxation, and brain activation (preventing cognitive decline). Recommended for: • Those looking for relaxation items when they have nothing to do with their hands • Those who like warm, natural material ornaments and grip stones • Those who want to relieve fatigue from computer work, etc. • Those looking for health-related gifts for their parents or grandparents Instant purchase OK Thank you. #WenwanWalnuts #Walnuts #GripBalls #HealthGoods #FingertipExercise #Acupressure #Relaxation #StressRelief #Rehabilitation #ForSeniors #HandPlay #Wenwan #Collection #NaturalMaterials #GoodLuckCharm #Hamatou #Pingguoyuan #Dacujin