Wiz need no introduction... but just in case:
 
WIZ Racing Products have been making knee sliders since 1989. We supply some of the best race teams and riders in the world and are extremely proud of our current and past associations with some of the very best motorcycle racers and record breaking riders.
All WIZ knee sliders are individually handmade here in the UK by a small, dedicated team of lifelong biking people, from the best, tried and tested, quality materials. Our sliders are solid, not hollow like some other brands, so have great durability and are fantastic value for money.