Review on Uxcell 50Pcs Plastic Accessories Teeth Power Transmission Products in Gears by Seth Singh

I bought these thinking they were identical to some cogs from another manufacturer that were nominally 4.5mm thick but were actually around 4, 6 mm were. They were the opposite, slightly thinner, 4.33mm. It's still workable, but I would have preferred if they were a bit thicker for more contact area.