specification：
colour：
use：
Code Size（MM） Wall thickness (MM) Color
ET1620 16 2.0 Pink/Red/Green/Sliver
ET2020 20 2.0 Pink/Red/Green/Sliver
ET2523 25 2.3 Pink/Red/Green/Sliver
ET3229 32 2.9 Pink/Red/Green/Sliver