I bought these grips for my 2018 Kawasaki Vulcan S, because the stock OEM grips were too small in diameter, leading to cramping on long rides. These grips do indeed have a larger diameter, and are more or less 'barrel-shaped', which puts the largest diameter near the center of the grip.Installation was, as expected, a bit difficult, but I had the advantage of having watched a number of YouTube videos showing how to do it... I consumed lots of WD-40 in the process.Since these are generic grips intended for application on a wide variety of bikes, they're not a 'perfect' fit. The grips are shorter than the OEM ones, and I was forced to cut off the closed end to accommodate the stock Kawasaki end caps... which leaves a modest gap between the end of the grip, and the end caps. I don't particularly mind that, though.The surface of the grips are an aggressive diamond pattern, which is a bit too sharp for my taste... but won't be a problem when wearing gloves.