Progressive Suspension 412 Chrome 12-1/2" Heavy Duty Shocks 412-4219C Precision double-walled, steel bodies to protect the inner cylinder and provide consistent damping. Spring pre-loaded can be adjusted easily with five-position cam. Precision ground, hard chromed steel shaft for strength and durability. Multi-stage, velocity sensitive internal valving for the ride and handling you want. Shocks come with full length chrome covers or short upper and lower chrome covers and springs.