RC drift car enthusiasts, this FastEddy bearing kit is exactly what you need for your Redcat RDS Drift Builders Kit! The set includes 12 of the 5x10x4 bearings and 4 of the 10x15x4 bearings - all sealed to keep out dirt and grime that can wreck your performance. Now here's the important part: double-check your specific model before ordering because bearing sizes can vary depending on when your RC was made and what upgrades you've installed. These aren't the original manufacturer parts, but they're quality replacements that work great and cost less. The photos in the listing are just for style reference - make sure you're matching the sizes I mentioned. If you notice any variation from what your car actually needs, just contact the seller and they'll help sort it out. Perfect for when you're doing maintenance or upgrades and want everything running smooth and fast. Nothing worse than worn-out bearings killing your drift game!