Graffiti Helmets Bike Helmet and Skateboard Helmet Make wearing a helmet fun by designing your own helmet with our professional quality markers. The ink is scratch-proof and water-proof. Use the included cleaning gel to erase your design and do it again and again. Your kit includes helmet, five markers in red/yellow/blue/green/purple, cleaning gel, scouring pad, and instruction manual. CPSC-certified kids' skateboard helmet and adult skateboard helmet Skateboard Helmet Size Medium: 52 - 56 cm / 20.5 - 22 (Age 7-12)