"An Introduction to Sportbike Suspension by Dave Moss of Catalyst Reaction", 2 DVD set. Features: * Setting Sag * Gross vs Fine adjusters * Relationship between preload and rebound * Click adjusters vs turn adjusters * Reading tires * Bike case studies * Geometry issues * High speed and low speed adjusters Retail was $ 24.95 .....New, SEALED( photos are of another set unsealed already sold )....asking $ 20.00 + shipping ( worldwide )