The JWL standard is a set of specified requirements for alloy wheels. This standard is established by the Japan authorities and it’s required for every vehicle in the country. These requirements are amongst the most rigorous in the industry. The letters JWL in the casting of a wheel is the certification that it was tested by the manufacturer to respect this standard.
The VIA marking represents the vehicle inspection association in Japan. They are independently testing alloy wheels to insure they are congruent to the JWL standard.
A tested wheel will be marked with the VIA and JWL letters.