Features so it is unique in the world.Due to the natual characteristics,Please note it a vary slight in color and size with the photo; Nice size easily put in your hand Avoid collision with hard objects. Try to avoid dust pollution. It should be properly placed when not use. Avoid long-term direct sunlight. Maintain proper humidity. Try to avoid contact with perfume, chemical liquid, soap and human sweat. Please use a clean, soft white cloth for wiping, not dyed cloth or hard fiber cloth.Note: Please note that there will be about 0.1-0.3cm errors becasue of the manual measurement. Due to various types of computers and monitors, the actual color of the item maybe a little slight from the photo.However, the image color is the approximation of the actual color. If you have any question about our item, please email us, we will reply you as soon as possible.