Boom Racing #HSTBBZ High Performance Full Ball Bearings Set Rubber Sealed (22 Total) for Tamiya Hotshot Lightweight upgrade instantly enhances overall performance in handling and durability Fits Perfectly. 5x Diameter( Inter): 5mm Diameter (Outer): 8mm Thickness: 2.5mm 17x Diameter( Inter): 5mm Diameter (Outer): 11mm Thickness: 4mm Included the tool box with seperater 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.