Bilstein AS2 Series shock absorbers are designed for motorsports applications and provide the user with the option to rebuild them. The modular aluminum design is offered in non- single and double adjustable configurations which provide superior on-vehicle tuning capabilities. The threaded body provides precise height adjustments for coilover setups and dissipates heat quickly. The hard anodized coating reduces internal friction and improves strength and durability (pistons piston bands and heims are sold separately to allow for a variety of combinations). AS2 Series shock absorbers are ideal for racers demanding a lightweight design with upgrade capability.