Four matched unbreakable plastic gears. The three larger gears are beveled on one side and can mesh at 90 degrees as well as the normal 180 degree angle. They have 5mm bores. Inserts are supplied to reduce the bore size to 3mm. The smallest gear has a 2mm bore. Gears are 41, 31, 21 and 13mm. Ships in a variety of colors (red, blue, green), no choice of color.
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Module 1 gears 
Reviewer:
A viewer
from Boston, MA USA
These appear to be metric module 1 gears. They are the right size and are marked with a raised "1". They fit the GR-5 SET OF 5 GEARS AND BUSHINGS perfectly, but have slightly sharper corners. All of the gears and bushings were attached to runners but detached cleanly and had no flashing. Mine are green.
1-1 of1
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