All the bearings and seals required to refit a wheel in one convenient package. Premium high-speed bearings feature low drag double lip seals on both sides to provide superior exclusion of water and dirt and improved grease retention. High performance Chevron SRI-II grease features special rust inhibitors for the most demanding applications. Type TC Nitrile Elastomer wheel seals are specifically designed to keep out water and dirt whilethe rubber coated outside diameter creates an optimum seal at the hub. Quality design and construction of every All Balls piece meets the toughest standards and conditions - from daily commuting to full-on racing all older bearing and seal designs are upgraded to the best and latest specs and designs. Fits: KTM 50 MINI ADVENTURE 1998-2007 50 SX JUNIOR ADVENTURE 2002-2008 50 SX PRO JUNIOR 1998-2008 50 SX PRO SENIOR 1998-2003 50 SX PRO SENIOR ADVENTURE 2007 Yamaha YZ80 1974-1992