Reddit reviews Letool10pcs High Carbon Steel 1.5mm Deep 3x12x4mm V Groove Guide Pulley Rail Ball Bearings Wheel
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ePacket delivery from China, it usually takes about 7-12 days to arrive you.Material:High carbon steelDimension:(Inside diameter)3mm x (outer diameter)12mm x (thickness)4mmV groove width: 2.5mmV groove deepness: 1mm
Ha! I broke mine 2 days ago. As far as I can tell, The bearing is a V623ZZ. 3mm ID x 12mm OD x 4mm Wide.
I found these on Amazon. They arrive tomorrow.