Imao’s sprockets are available from a wide variety of materials and sizes.

BIS: Plastic Idle Sprockets
・ Light-duty
・ Stable rotation with moulded-in ball bearing
・ Glass-fiber reinforced polyamide body for high wear resistance
・ Applicable to chain No. 25, 35, 40, 50, 60, 80
・ For 10mm and 15mm diameter spindle
Use with PID Idler Pins.

Materials:
Sprocket body: Glass-fiber reinforced polyamide plastic, Black color
Bearing: Steel

Datasheet: https://www.imao.co.jp/files/on-cat/pdf/en/bis-e.pdf

Parameter Name	Parameter Value
Teeth	straight-toothed
Other characteristics	for chains polyamide with ball bearing
Diameter (mm)	43 - 98