T25 Timing Pulley and Timing Belt Kit for Reprap or 3d Printer
The belt is open, meaning you can cut it to length. 2 meters should be enough for most 3d printers. If you are building a Rostock, I think it is required that you order 3 of these sets. 1 set should be sufficent for people building Prusa Mendels.
Pulley is made out of aluminum. These are much higher quality and more accurate for printing than printed pulleys. These should help with print quality.
Belt is made of polyurethane and has steel cords inside for reinforcement. Belt is 6 mm wide and 2 meters in length,