Dia  About 2cm,Size:About 20cm,Material : Plastic ,Notice : ,1:As different computers display colors differently, the color of the actual item may vary slightly from the above images.,2:Attention: please allow 1-2 cm(0.4-0.7in) error of measurement., ,Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.