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Ordering instructions For small orders in our store, please choose to place an order. Generally, it will be shipped on the same day, Contact customer service for bulk orders. Our store offers bulk OEM services, ODM, If you need the color box or instruction manual, please contact customer service for specific discussion. PRODUCT INFORMATION Product Name: Grip Strength Ball Product structure: New PC material shell/all metal alloy ball core Product size: approximately 70 * 70 * 55CM Packaging: In a neutral English color box, with 1 built-in ball, 1 wrist strap, and 1 instruction manual (optional in both Chinese and English) (Starting from 3000 pieces, OEM color boxes, manuals, and leather cases are available. Please contact customer service for more information.) Packing information: 40 pieces/box, 50 pieces/box, 60 pieces/box, 100 pieces/box (priority shipping for full box orders) Product quality features: Made of brand new materials, available in both high and low-end styles Product Introduction: The gyro ball, also known as the powerful fitness ball, wrist strength ball, or magic ball, is currently the fastest artificial power device in the world. Pure mechanical, no need for batteries or power sources to start, using gyroscopes and principles of celestial mechanics, under the action of inertia law and centrifugal force, the rotor continues to rotate at high speed, generating strong force to keep the wrist and arm in autonomous motion. By human control, the rhythm and speed of the core rotation can be adjusted arbitrarily. The faster the speed, the greater the force generated, which can be equivalent to 50 different weights of dumbbells. At 8000 revolutions per minute, there is approximately 14kg of force, and at 10000 revolutions, there is approximately 22kg of force. The world record has exceeded 20000 revolutions per minute. Due to the powerful force generated by its high-speed rotation, it is very helpful in enhancing our finger grip strength, wrist joint agility, and arm strength and resilience. It integrates sports, entertainment, and fitness, and is increasingly favored and loved by people all over the world.