Michelin 20" - 500A inner tube

Butyl inner tube

ETRTO 28/37 - 440/451
500x37A

20 x 1 3/8 + 1 3/4

Butyl is a synthetic rubber that offers safety and reliability,
with good puncture resistance and better pressure resistance than latex.
Presta valve with 29mm non-removable thread.

Ref: F3

Sold in Michelin cardboard box.