I recently installed a set of Hot Grips on my K100. I was a little nervous after reading the instructions, but I took my time, studied the instructions, trial fitted everything, studied the instructions, trial fitted everything, and studied the instructions b/4 taking the full plunge. Since I got the grips for Christmas, I don't know for sure how much they cost, but I suspect it was much more than $29. Looks like I may try a pair of the heated pads for my Royal Star. By the way, I am so pleased with the comfort of the Hot Grips that I spent yesterday installing a heated seat pad in my Corbin.