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SPARKFUN Cable Carrier - 10x15mm (0.5m Length), ROB-13207

$10.95
Inner Bit Height: 10mm Inner Bit Width: 15mm Outer Bit Height: 14 Outer Bit Width: 22mm Minimum Bend Radius: 20mm Reinforced Nylon Structure

TAMIYA 4-Speed Worm Gearbox Kit, 72008

$19.50
This versatile, high-efficiency gearbox lets you build one of the following gear ratios: 11.6:1, 29.8:1, 76.5:1, 196.7:1, 505.9:1, and 1300.9:1.