Smooth. Classic Drag bar the Biltwell way. Manufactured from 1" diameter .120" (3mm) thick madrell bent seamless 4130 chromoly steel. Bars are not knurled at the risers. This non-knurled design offers a larger clamping area which provides more grip. Comes with a chrome electroplated finish. Approx. dimensions: 27.25" wide x 0" high x 2" pullback.Note: Check your local MCS dealer or the MCS sales department for exact type of approval and validity on bike model and years on the test report. Pre-81 H-D with 1" ID risers