Titleist TSi 1 Golf Driver The Titleist TSi 1 Golf Driver by Titleist is built for players that have moderate swing speeds and want an ultra-lightweight configuration to maximise distance. Featuring super-light components and a deep, face-centered CG, launch and ball speeds both increase. ULTRA-LIGHTWEIGHT The TSi1 metals have been manufactured and weighted precisely to deliver maximum launch at distance from moderate swing speeds. PERFORMANCE-TUNED ADJUSTABILITY Titleist has engineered adjustability features to offer maximum benefits for every type of player. Get the most out of every swing. MULTI-DIMENSIONAL STABILITY Most players think High MOI is equated by heel-to-toe forgiveness. But, Titleist has employed a more holistic approach to their MOI design. The precise weighting also delivers more speed and a tighter spin range up and down the face.