BEMONOC 5Pcs 2GT Idler Timing Belt Pulley 16 Teeth 3mm Bore with Dual Ball Bearing for GT2 Timing Belt Width 6mm

3 of the five had raised ridges/burrs on parts of the tips of some of the teeth, pronounced enough that I was worried about them excessively wearing the belts in the long term, not a big deal on a home 3-d printer, and they never got a chance to as the bearings quickly became audibly crunchy and begun grinding themselves into paste. I went through three on the Y-axis and two on the X-axis in less than two years of sporadic use. I may try to find some better quality bearings to press in and salvage the two decent ly formed ones, but if I were you I'd look elsewhere.

No issues, I'd recommend. Used for my Anet AIN'T.