Type 2820 Adjustable Shock, Black painted 28mm sealed damper unit with standard chrome spring(SA). Wide ranging single circuit progressive damping adjustment with automatic compression / rebound balance, 3 position spring pre-load adjustment by enclosed cam. Supplied as complete pair with mounting bushes, tools and instructions for spring and damping adjustments. These units are designed to be fitted with the damping adjuster at the bottom. 2 year guarantee.