Cost-effective, virtually friction-free system. Our sturdy triangular aluminum extrusion track is lightweight yet durable and can be used without a support stand. 2 meters in length, it has a smooth surface and high linearity due to precision machining. Two rows of air holes are spaced 2.4 cm apart. Full length metric tape is placed on the track with a guide groove for spark paper. Linear Air Track with accessories, 2m length. (this item require electric blower which not included)