From 2003 to 2007, Character Product
released a series of 2'' minifigures called "Prokaku Heroes".
The Prokaku line featured many prominent Wrestlers from various Japanese Wrestling promotions.
Initially, there were 9 volumes of minifigures released including multiple exlusives in the form of repaints, mail-away offers and store exclusives.
The first wave of Character Product's Prokaku Heroes line.
Upon it's release, Volume 1 was a huge hit with Japanese Wrestling fans and sold out almost instantly overnight. "Vo1. 1 would consist of a collection of 35, two-inch minifigures with 1
"secret" mystery figure rounding out the set. Vol. 1. would be released
with a total production number of 180,000 pieces throughout Japan." - Source