These seem to be top-notch quality pulleys. In particular, their ball bearings are snug, unlike the wobbly, loose-fitting bearings I bought from a major home supply store, that these are replacing.I will say a word about customer service. The original package was torn open in the mail and the pulleys must have fallen out because it arrived empty. Their customer service immediately sent me a replacement by priority mail, no questions asked.
Awesome company! Real liftmaster OEM part and installation directions. USPS priority delivery arrived in 3 days. I got automated emails on status. I popped in the part and working garage door in less than 5 minutes. Saved a $300 service call, insane parts price, and a week before they could schedule. Thank you!