By training the reaction ability and firmness between the fingers, the fingers become more flexible, the fingers are more powerful, and the finger strength is improved. ABS material has the characteristics of high strength, corrosion resistance, high temperature resistance, light weight, wear resistance and durability, which increases the life of the product. Ergonomically comfortable, compact and lightweight , it strengthens your forearms and wrists wherever you go. 42mm diameter giant screen, portable display is clear. Comfortable handle with four-way adjustment fingers for better power utilization. Product size: 165*75*24mm Note: The data are all manually measured, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.