Midrange Captive Ball Traveler Cars are built to handle high loads on boats from 27 ft to 34 ft (8 m to 10 m). The one-piece solid aluminum construction is lightweight and strong. Machined aluminum Hardkote-anodized races permit Torlon� bearings to transition smoothly from the active to return race. Stainless steel wire guides keep the balls captive. Shackle/toggle cars have low pivot points to handle non-vertical loads. On 1626 and 1627 cars, blocks attach directly to the toggle ears for a low-profile, compact system. 1640 and 1641 cars use car-mounted control blocks. See chart on page 117 to size traveler to mainsail area. Traveler Kits Use the 1630 kit for boats to 34 ft (10 m) with maximum mainsail area of 275 ft2 (25 m2) for end-boom, or 225 ft2 (21 m2) for mid-boom sheeting.