They are a range of 6 Custom Harley Bikes that were released just before IMAI announced that they are bust.
Pics and some info here (Japanese site):
http://home9.highway.ne.jp/tomobe2/newpage0.htm
Interesting is that I think only 2 of the Kits have chromed parts, the rest are all plain plastic.
Instructions for building the Bikes from the "stock" Kits call for customisation steps( chopping fenders, shortening shocks, raking the forks, lowering the frame, cutting handle bars, etc) bassically the same way it would have been done on the real Bikes.
Models are bit rough and feature a unique set of Instructions, but should build up nicely. Lots of left-over bits and some good tips on customisation are included.
What I like about them they build up into "Custom Bikes" not your average off-the-floor type of Model, another Company that make similar Kits is Aoshima with their American Street Bike "Steeds" and similar custom Kits.
Tamiya kits are nice, but if I want to hit the wilder side of Motorbikes I will go for Aoshima, IMAI(gone
) or similar.