Sizes (Teeth): 30, 35, 40, 40, 45, 50, 50, 60 and 60.
Bore: 12mm, Width: 6.5mm, Keyway: 4mm 
All measurements are approx may have +/-1mm variation

Diametrical Pitch: 26

Gear with 30 teeth has a diameter of 31.7mm 

Gear with 35 teeth has a diameter of 36.7mm 

Both Gears with 40 teeth has diameter has a diameter of 41.7mm

Gear with 45 teeth has a diameter of 47mm 

Both Gears with 50 diameter has a diameter of 51.7mm 

Gear with 60 teeth has a diameter of 61.7mm 

All the dimensions are approximate

Content: 

9 Gears as shown in pictures

Material:
 Metal last you forever