The four sizes of the helmet shall

The four sizes of the helmet shall be made to the details laid down in the
appropriate drawings and templates.
The data for the manufacture of the shell moulds to be held as 3D CAD files to
allow shells to be machined using appropriate CNC machinery. Shell dimensions
to conform to MP3211 – MP3214.
The size, dimensions and locations of all fittings, internal and external, shall be
determined from the appropriate masters/sealed samples, drawings and templates.