Hey RC enthusiasts! If you're running a Team Associated Apex2 Sport A550 Rally Car, this FastEddy sealed bearing kit is exactly what you need to keep your ride smooth and fast. The kit includes everything you need: (6) 4x8x3mm bearings, (8) 5x10x4mm bearings, and (10) 10x15x4mm bearings - all sealed to keep out dirt and grime that can wreck your performance. These bearings are perfect replacements for worn-out stock bearings and will seriously reduce friction for better speed and longer run times. Just a heads up - always double-check your specific model before ordering since bearing sizes can vary depending on when your car was made and any upgrades you've installed. FastEddy is known for quality RC parts that hold up to serious bashing and racing. Whether you're just getting into the hobby or you're a seasoned racer, upgrading to these sealed bearings will make a noticeable difference in how your Apex2 handles. Less friction means more speed and better battery life - what's not to love? Your rally car will thank you with smoother operation and less maintenance between runs!