This product is a titanium bottom bracket designed for use with Red Line Flight 401 cranks and American bottom bracket shells. It comes with a stem ring and stickers and is compatible with various types of BMX bikes. The spindle type is a VTG Redline 401 Flight Crank Spline and the item length is 129mm. Made in the United States, this set includes one bottom bracket and is a high-quality upgrade for BMX VTG enthusiasts.