Odyssey White Steel 2-Ball SRT. The latest in Odyssey's 2-ball alignment uses Saturn Ring Technology (SRT) increasing the moment of inertia to keep the putter on line during the stroke. Dual Insert Technology with milled stainless steel inside a White Hot urethane insert. Lightweight insert positions putter weight deep in the putter head for greater resistance to twisting and increased stability while giving you incredibly soft feel. The stainless steel face insert is machine milled for a consistent, flat surface with improved roll and pleasing sound. Two-line alignment system squares the putter face to help focus sight