Daewon Song Tune Up Kits Includes Bearings, Spacers, Axle Nuts, Shield Tool, and Extra Shields. Premium Pro Rated Andal?e Bearings Designed and Tested by Daewon Song to withstand the wear and abuse of daily skateboarding. G5 precision ball bearings for a true roll and higher speeds. High carbon, chromium alloy bearing steel races for high strength to resist cracking and contact rolling fatigue. Removable frictionless rubber shields for easy cleaning.