Product Overview: Platinum Si3 Putter Features: Product Features: The Si3 features a thermoplastic face insert 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. All Putter Models Have SeeMore's Patented RifleScope Technology (RST) Alignment System, For A True Reference Point For Perfect Alignment And Set Up On Every Putt.