The Facnor LS70 furling system drum and swivel are fitted with a ''bearing box''. This was tested over ocean races under loads up to 20 to 30 times higher than a 30ft cruising boat. Even under high halyard tension furling remains easy. Smooth rotation even under high loads. Maintenance free. Strong connections. Adjustable guides. Insulation between different materials. 40 micron hard anodizing.