BIND-FREE STAND-UP TOGGLE - Stand-up toggle holds mainsheet block upright off deck.Toggle attaches low inside car so off-angle mainsheet loads apply less leverage on balls, allowing cars to roll freely. Cars accept loads to 40-degrees from vertical without binding. Carbo or Black Magic® control blocks attach directly to toggle ears to reduce load on car so bearings don’t bind. STRONG, LIGHT CAR BODY -One-piece solid 6061-T6 aluminum construction for strength and durability.CNC sculpted to remove excess weight. CAPTIVE BEARINGS - Wire guides keep balls captive making cars easy to load and maintain.Guides circulate free-rolling Torlon® bearings smoothly under both high and low loads. LONG-LASTING PROTECTIVE FINISH - Car bodies and bearing races are deep-saturation Hardkote-anodized for strength and durability, and UV-stabilized with black additive for maximum protection. THE HARKEN DIFFERENCE - Since our introduction of the recirculating ball bearing traveler twenty-five years ago, thousands of racers and cruisers have depended on these strong, lightweight systems for free-running control and fast sail shape on all points of sail.