I played mine in the mid to late 80s. I have returned to a pair of them in the last few years as my stick of choice. I inquired about them with PK a couple years back and received info on the Boron Ace... so I gave up then.
PK "Pro Boron" w/Big Hitter 17 Mains/Liberty 16 crosses is money!!!
The PK "Copper Ace" w/gut ain't shabby either!