Boom Racing #TRV33BBZ High Performance Full Ball Bearings Set Rubber Sealed (38 Total) for Traxxas Revo 3.3 Lightweight upgrade instantly enhances overall performance in handling and durability These high performance bearings reduce rolling resistance and overall friction for your Traxxas Revo 3.3. They spin faster for improved top speed, accelerate more rapidly for better performance off the line and have lower friction which makes your drive-line more efficient so batteries last longer and motors run cooler. The rubber seal protects dirt and fine dust from entering, making them more durable. 4x Diameter( Inter): 12mm Diameter (Outer): 18mm ... more details below Takes 7 to 15 business days by standard airmail shipping. 80% of packages arrive within 10 business days. Most packages ship within 12 hours. Please allow 1 extra day if order is placed during the weekend. Expediated shipping is shipped by DHL or Fedex. Arrives in about than 2-5 days. Major cities will receive orders earlier.