Constructed of tough extruded aluminum, features include our exclusive built-in leveling system and convenient, plug-in accessories designed to provide years of accurate results. A scale in centimeters and millimeters is clearly printed along one side. Features: • Straight — to within 0.4mm over the entire length of the air track. • Durable — 3.2mm thick walls in a 4.8mm thick channel makes it more substantial than other air tracks. • Convenient — Easy to use leveling system and plug-in accessories • Flexible — Use with any of our recording systems • Versatile — Widest range of accessories available A generous range of accessories is included: 2 end mounts with hole arrays for plugging in accessories; a low-friction, low inertia pulley; 2 gliders with Velcro™ bumpers and spring attachments for inelastic and elastic collision work; 3 plug-in metal flags for photogate work; 2 mass centering pins and 5 slotted masses for loading the gliders; a mass hanger and 5 accelerating masses; 2 spring attachments and 3 springs for oscillation experiments. An air source is needed for operation. Also available in 1.5m version.