Feature: Memory foam material brings fine tenacity,comfort and durability. Non-toxic with contact,no sideeffect,no allergy, no volatile matter. Out diameter of 25mm creates comfort,and absorb the vibration of coiled,rotary and pen tattoo machines. Absorb the vibration of the machine,improve the coloring efficiency and reduce the skin damage. Alleviates vibrations that cause carpal tunnel & hand issues in the every day or long term of tattoo working. Description: Material:memory foam Dimension:out diameter 25mm This memory cover for tattoo grip is a fantastic device for great tattooing. Package include: 1pcs Tattoo Grip Cover Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please in kind prevail.