Harken’s award-winning Switch T-Track Battcar system cuts the stack height of mainsails on large yachts by half, making it much easier for crew to put on sail covers and to connect/disconnect halyards. This simple, yet sophisticated patented switch system neatly stacks cars side-by-side on top of the boom. Cars run on low-friction plastic slides. Cars are Hard Lube-anodized and UV-stabilized for durability. Available in black or clear anodized.