Torlon ball bearings in each swivel carry the load so that the sail furls freely. An over center halyard attachment can distribute the load uniformly to each ball bearing, providing a smooth rotation.

Small Boat Traveller Cars move freely, even under high non-vertical loads. Low-load dinghy cars use Delrin^® Bearings, while hi-load cars for large dinghies, keel boats and offshore boats to 27 ft (8m) use Torlon balls to increase working load. Torlon balls provide maximum load carrying ability.