PROAIM 12ft Straight Rail Track System | Professional Heavy Duty Portable Aluminum Video Camera Tripod Dolly + Carry Bag (P-TRK-12) 12ft STRAIGHT VIDEO TRIPOD TRACK is constructed from Aluminium with ultra-smooth running surface HEAVY DUTY camera DOLLY TRACK has weighing capacity of 400kg /882lbs EXTENDABLE RAIL TRACK SYSTEM includes end support brackets which prevents run off and offers smooth Tracking andGliding Shots TRACK BREAKS DOWN into 4 SECTIONS which are easy and quick to assemble PORTABLE AND TRAVEL FRIENDLY Track kit comes in PROTECTIVE STORAGE CASE with easy tote handles