Material:ABS Description: 1. Unit weight: 38g 2. Specifications: standard model (unisex, suitable for those with thick fingers), standard model bold (unisex, suitable for thick hands), children (suitable for children under 1.4 meters) 3. Uses: expand fingers, exercise span, stretch ligaments 4. Features: can quickly open fingers, increase span, make fingers more flexible, elastic bar, strong and durable, round design does not hurt fingers, comfortable and reliable, adjustable ring spacing 5. Note: use when not practicing the piano, not wear when playing the piano
