8. Materials
The provisions for materials include only those related with light alloy units, and no particular provision has been made on materials other than those for light alloy units. Nevertheless, the provisions of JIS or equivalent standards shall be taken into consideration for the above.
Concerning the manufacturing methods, no provisions have been established; because many manufacturing methods, including those for the composite construction type wheels, have already been employed, and better manufacturing methods to be developed in future will be applied.