Currently, the Omni+™ Series offers four outer-diameter (OD) sizes: 60 mm, 70 mm, 100mm, and 130mm. The 60mm and 70mm sizes come in 12.5 mm, 25 mm, and 50 mm stack lengths. The 100mm and 130mm sizes come in 12.5mm, 25mm, 37.5mm, and 50mm stack lengths. Click for more information on the Omni+ Series motors.