The new SiSeries combines the proprietary and proven alignment benefits of SeeMore RifleScope Technology (RST) in a new line of putters featuring thermoplastic face inserts for a softer feel and a slightly lower rebound characteristic preferred by some players. Si3 is a classic small mallet with a slightly back of center shaft design. Si3 is the straight shaft option, featuring 1/3 toe hang, and Si3w is the offset version featuring 5 percent toe hang, near face balanced.