SoooKu Blue Hand Finger Exerciser Forearm Strengthener muscle strength fingers flexibility Best Gift For beginner It is easy and convenient to operate. Curvaceous design with ergonomically and compact structure, user friendly. Easy carry and store Develop fingers flexibility, strength and coordination Use this and exercise each finger Palm rest allow user exercise the entire hand Build hand and forearm strength Uses the thumb screw to adjust each finger strength separately Improve the injured fingers recovery ability Good for use at home Material:Hard plastic & Stainless steel Size:one size fit all Compact and ultra-light design means you can carry it in your pocket, bag or instrument case.