Super-Bands™ polyurethane ring 3/8 inch ID green
Ships from US and is sold by Marco Specialties$1.40
Super-Bands™ polyurethane O-ring, standard 3/8 inch Inner
Diameter, green gloss.
Inner diameter is .38 inches (9.5mm) and the cross sectional
diameter is standard 3/16 inch (4.7mm).