IMPROVED Upper+Lower Bushing for Crank Brothers Joplin3&4, Maverick Speedball
Tighter tolerance
Other parts for Crank Brothers Joplin 3&4 and Maverick Speedball seatposts:
Improved Dust wiper (only Joplin seat posts)
http://www.ebay.com/itm/291650425038?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649