Black Diamond Center Bars-Long Flex. Sold in pairs. Specifications for Black Diamond Center Bars: Manufacturer: Black Diamond Color: Black Weight: 3 oz Climbing Accessory Type: Other Features of Black Diamond Center Bars: Standard Center Bars: compatible with Contact Cyborg Sabretooth and Serac Crampons. 108 g 3.8 oz BD400672POLSALL1. Standard Flex Center Bars: comprised of a flexible spring-steel center bar that is compatible with all crampons. 84 g 3 oz BD400674POLSALL1 Assymetrical Center Bars: An aggressively curved and asymmetrical center bar for boots with highly curved soles. Compatible with Contact Cyborg Sabretooth and Serac Crampons. 108 g 3.8 oz BD400671POLSALL1 Long Center Bars: Extra-large center bar for oversized boots. Compatible with Contact Cyborg Sabretooth and Serac Crampons. 148 g 5.2 oz BD400670POLSALL1 Long Flex Center Bars: allow you to adjust your crampons to fit oversized boots. Extra-large spring-steel center bar is compatible with all crampons. 115 g 4 oz BD400673POLSALL1 Package Contents: Black Diamond Center Bars Black Diamond Center Bars-Long Flex