12 pole pedal assist sensor that mounts directly to your chainring. This sensor is only compatible with the Cycle Analyst pedal assist system.
More info from Grin:
"CA3 Compatible Quadrature PAS Sensor, with Split 12 Magnet Ring for Chainring Mount. Must have Steel Chainring bolts. For 74mm 5 Bbolt and 64mm 4 Bolt Cranksets."
