Front bars are made from 1-1/4" high-strength steel for long-lasting durability Precision bent and welded for a perfect fit every time Neoprene o-rings provide traction in all climates Rear highway bars constructed from 1" tubing; compatible with most stock exhaust systems; require removal of rear footpegs/floorboards U.S. Patent #D361311 Not recommended for use with extended forward controls or extended floorboards.. GUARD ENG LINBR FLTR 15B