Ordered them to try and one bearing broke right out of the box, feels very gritty and catchy. I have used others to replace the bearings in my Kubota Z125S idler and idler pulley. We'll see how they hold up, but I'm not sure they'll last very long as there doesn't seem to be any quality control. Hopefully they'll last a season and certainly better than paying $40 in Kubota for new pulleys with bearings.