System A Slider Typical Boat Size: Monohulls: length 37 - 50 ft (11.3 - 15.2 m); mainsail area under 600 ft2 (56 m2) Multihulls: length 30 - 40 ft (9.1 - 12.2 m); mainsail area under 500 ft2 (46 m2) The one-piece solid aluminum construction is lightweight and strong. Cars are easily removed from the track by freeing the screwpin endstop and sliding them off. Both CB and Slider Battcar systems use the same track. Mix and match sliders and ball bearing cars for optimal performance and cost. Slider Cars Slider Battcars offer a lightweight, cost effective way to raise, reef, and douse mainsails. Hardkote-anodized aluminum cars slide on low-friction plastic inserts. The compact car size translates into reduced weight and stack height