ProTip Size:#3 700 Series option is a

700 Series option is a Balance Drive II Extension with bearing sets compatible with Balance Drive 1 CyberHammers: 700 Series CyberHammers

Specs -  SN R75221

Classic Rigid profile

Hardened steel

To use the Weight Riser

ProTip Size:#3 700 Series option is aThe ideal tuning tip is the invisible link between your hand and the strings. The Reyburn ProTip is the product of several years of rethinking what a tuning tip should be, designing, prototyping, and testing. That's why they're now included on all Rigid and 800 Series CyberHammers. To our knowledge, the ProTip is the first tuning tip made from a proper tool steel, rather than a standard high carbon or chrome moly steel. We start with the legendary D2