I emailed.

Hello.

Massager frame are our new track models. Frame are one by one custom
made (not production frame) Build to finish are master frame builder
Koichi Yamaguchi.

Frame tubing are 4130 Cr.Mo heat treated. Massager frame are require
more strength then regular competition track frame. Competition track
frame are not design for the back pedaling (fixed gear braking) this
yield stress on chain stays, seat stays and rear dropouts.

Yamaguchi Massager frame are built with high tensile strength chain
stays, seat stays and Build with Yamaguchi 4140 Cr.Mo.. 6.2mm laser
cut track dropouts. Normal track dropouts are 4.5~5.0mm thick.

Frame basics are Yamaguchi-True Temper Cr.Mo. custom tubing, I.C.
Lugged (hand cut) and dropouts are Yamaguchi heavy-duty 6.2mm laser
cut track dropouts.
Fork are raked or straight 24mm Cr.Mo. round blades with I.C . fork crown.

Style are traditional (old school) Look. Price are start from $1400
frame and fork one single color Dupont imron paint)
Front/rear brake hole, cable guides braze-on etc are all option.

Current turnaround time is about 90 days.

Sincerely,

Koichi Yamaguchi