This I-Beam traveler series is the smallest in the range. Four wheel cars are used on dinghies and catamarans, six wheel cars are suitable for boats up to 25'. Strong, stainless-steel bodies w/flared sides & angled ball bearing wheels Provides high load capacity & smooth operation Modular track end fittings can be assembled to provide up to 4:1 control line purchase Can be mounted to permit control lines to be pulled horizontally or vertically Black anodized Grade 6351-T5 extruded Aluminum track Track supplied with RF981 Nylon inserts