Advantages : - Designed to absorb impact using nitrogen gas on a bladder system in a separate tube. - Equipped with progressive spring amp; spring preload to enable spring hardness adjustment for daily use. Product Code : 51200-BEJ05-OK3BW / OK302-320T-12-829 (BLACK/WHITE/SILVER) 51200-BEJ05-OK3GY / OK302-320T-12-849 (BLACK/YELLOW/SILVER) 51200-BEJ05-OK3BR / OK302-320T-12-859 (BLACK/RED/SILVER) Spring Rate : 42-25-35-195