Klucky pucks,,, hands down the most long lasting slider out there bar none. After I first dragged my first knee four years ago, it wasn't long until I burned through 2 pairs of stock Dainese pucks. This was due to their soft compound and hollowness. A set of Klucky pucks on the other hand, can last me 5 times longer, because of the their harder compound, which btw, allows them to slide over the asphalt easier then the aforementioned. Their also solid. I've even worn them down to their rivets, (less then a 1/4 inch) and they still are fully functional. The velcro on them is top rated and have never flown off, even with high track speeds and re-positioning them multiple times.