Gearheads, listen up! If you're running a Traxxas Revo 3.3 and need smooth, reliable performance, these FastEddy Sealed Bearings are a must-have. This pack gives you 10 high-quality bearings, each sized at 5x11x4mm (that's 5mm inner diameter, 11mm outer, 4mm thickness). They're made from steel/chrome with two rubber seals to keep out dirt, dust, and grime – essential for keeping your RC car running fast and lasting longer. Whether you're replacing worn-out stock bearings or doing an upgrade, these are known for their durability and smooth operation in the hobby community. They also work great for other uses like robotics, bicycles, and small machinery. Just pop out the old ones and press these in. No more gritty steering or sluggish wheels! A simple upgrade that makes a big difference. Keep your Revo rolling smooth with this essential maintenance pack.