Boom Racing #TT2BBZ High Performance Full Ball Bearings Set Rubber Sealed (16Total) for Tamiya TT-02 Lightweight upgrade instantly enhances overall performance in handling and durability These high performance bearings reduce rolling resistance and overall friction for your Tamiya TT-02. 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. Bearing set includes: 8 piece - 5*10*4mm 4 piece - 5*11*4mm 4 piece - 8*12*3.5mm 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.