Neewer Professional Tabletop Mobile Rolling Slider Dolly Car Skater Video Track Rail for Digital SLR Cameras & Video Camcorders/LED Lights/Flash Light (Blue) Aluminum Alloy Platform with Super Steady and Firm Rubber Wheels Mini size with articulating design, Lightweight and convenient to carry Wheel-to-wheel distance: 3.7"/95mm Body middle width: 1.6"/ 4mm Body length: 5.9"/15mm