Feature
Material: Made of high-quality silicone rubber
Product performance: corrosion resistance, acid and alkali resistance, high and low temperature resistance (+250°C/-40°C), good sealing, high temperature resistance, aging resistance, firm fit
Size: inner diameter=3mm-40.5mm (the size of A in the figure)
Color: black or white
Shape: round

Note: The size is measured by hand, there may be errors, please forgive me.