The Carbon Fiber Slider with 19mm carbon fiber rails is available in 4 different sizes: 60, 80 and 100 lengths. The carriage features 10 bearings with the inner 2 being adjustable to change the drag as it smoothly glides along the rails. There are multiple threads on the carriage for mounting optional accessories. The angle adjustable rubber tipped legs are also height adjustable for leveling on uneven surfaces. Included is a padded carrying case.