These slides are made with Gar-du U.H.M.W.P.E. Polyethyleneand have the best fit available anywhere. Our manufacturer isone of only two original equipment suppliers in the USA andCanada and the only one that also sells to the aftermarket.Rest assured we supply only the best, made in the USA andpriced right too!Slides w/Graphite available. Graphite lubricates the sliderail allowing for better performance and longher life.Graphite is especially important with today's high performancesleds. Don't be fooled by cheaper "graphite" slides that areactually only colored with lamp black or contain lessgraphite. Quality costs extra vut yileds better results.Don't settle for less.