Model Number: 021705 Brand Name: Heng Da Key Specifications/Special Features: Precision GT2 timing belt. Choose quantity to specify length in increments of 1 meter.Quality belt reinforced with fiberglass threads.For 3D printing applications, GT2 2mm belt system works better than T5, T2.5, it gives better smoothness and accuracy of positioning, resulting in better printing quality. GT2 timing belt system especially suited for linear movement and positioning applications.Timing belt:
Highest quality precision timing belt, not cheap Chinese replacement. Made of neoprene - synthetic rubber reinforced with fiberglass cords for superior strength. Neoprene - oil-resistant substitute for natural rubber, was invented by DuPont scientists on April 17, 1930. Balanced combination of polymer's properties:

Resists degradation from sun, ozone and weather
Performs well in contact with oils and many chemicals
Remains useful over a wide temperature range
Displays outstanding physical toughness
Resists burning inherently better than exclusively hydrocarbon rubbers
Outstanding resistance to damage caused by flexing and twisting

Specifications:

Belt material: neoprene (synthetic rubber)
Belt type: GT2/P2M
Pitch (mm): 2
Belt width (mm): 6
Core wire material: glass fiber
Circumference length (mm): open loop
Number of teeth: N/A
Belt shape: open end
Belt tooth surface: standard (single sided)
Belt shape type: round tooth profile high torque