nameHand Grip Exerciser Size:35.6*21.6*21.6cm/14.01in*8.50in*8.50in Color:Black/sliver Material:Spring steel Function:Arm and wrist intensive training Installation method: 1.Check product accessories. 2.Place the handle in the center of the base. 3.Put in the buffer metal piece and fix the nut. 4.Check product firmness 5.The four adsorption points of the base are pressed tightly on a flat table, and an appropriate amount of water can be added to enhance the adsorption capacity, and try to evacuate the air to ensure a firm fixation. 6.Re-press the suction cup firmly before each use. Notice: 1.Keep your head away from the equipment when using it to avoid injury. 2.For your entertainment experience, it is not recommended to use in the following situations: Uneven tables/ fragile tables/ tables that are too small. Note: Product sizes are measured by hand, please carefully compare the size when purchasing. Please allow 1-3cm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item.Thanks for your understanding.