The SYL-960 Elite Camera Track Dolly Hybrid from Glide Gear features swivel & slide wheels. It is machined from aircraft grade 6061 anodized aluminum alloy to very tight tolerances for maximum precision and strength. So, although this system is strong enough to be used with rigs exceeding 35 lb, it is only a few pounds in weight, and folds up to be carried in the carry bag. At the heart of the SYL-960 track dolly system is the sliding swivel wheel system. These wheels are not only full 360° swivel but are also able to freely slide within the wheel housing in any direction by an extra 1 (25.4mm). This means that the track can be as uneven as 2 (50.8mm) in places and still not affect the smooth operation of the Glide Gear SYL-960 track dolly. In addition to all of these features, the SYL-901 is a hybrid that can easily be converted into a rolling camera dolly with the included regular swivel wheel casters. Each swivel track wheel assembly comes with 4 track wheels for maximum stability and each caster wheel has 360° swivel and locking mechanism. These track wheels are made for movement along a track and have as much surface area in contact with the track surface as possible.