Gates POWER GRIP GT2 LL-2GT EPDM Belt - 1 meter

2GT belt in EPDM that lasts longer, require less force to tension and can withstand higher temperatures than normal belts, 135c vs 80c.

Sold by the meter. 4 pcs = 4 meters of continuous belt, e.g.

Generally I would recommend the closed loop version since it's better. Two pieces of 2.4 meter is enough for any standard printer up to at least a 350. Just cut them open to make them open loop.