Oxford Rok Drop Sparkie Motorcycle Knee Sliders - Black The Oxford Rok Drop Sparkie motorcycle knee sliders are made from a hard wearing long lasting compound, making them suitable for normal road use only. Constructed from hard wearing materials, you’re guaranteed both excellent performance and feel. Available in range of colours to match any riders gear, bike and personal taste. Motorcycle Knee Sliders Features: Made from a hard wearing, long lasting compound. Excellent combination of ‘skim’ performance and ‘feel’. Secure hook and loop fixing. Metal studs create sparks. Replace slider when wear indicator becomes visible (small holes will start to appear on the surface).