The compact size of battcars translates into reduced weight and stack height. The sail is also easy to take off: simply remove the screwpin endstop and slide the cars (with the sail) off the track. System A sliders are designed for monohulls with mainsails of less than 425 ft (40m) or multihulls with less than 350 ft (32 m). Harddkote-anodized aluminum cars slide on low-friction plastic inserts. The headboard assembly uses two cars to handle the high load and is compatible with most mainsails Sliders run on ball bearing track allowing future upgrades to ball bearing cars Use with 3807 or 2720 track