Schumacher, in conjunction with Schuberth, helped develop the first lightweight carbon helmet. In 2004, a prototype was publicly tested by being driven over by a tank; it survived intact. The helmet kept the driver cool by funneling directed airflow through fifty holes. Schumacher's original helmet sported the colours of the German flag and his sponsor's decals. On the top was a blue circle with white astroids. From the 2000 Monaco Grand Prix, in order to differentiate his colours from his new teammate Rubens Barrichello—whose helmet was predominantly white with a blue circle on top and a red ellipsis surrounding the visor—Schumacher changed the upper blue colour and some of the white areas to red. For the 2006 Brazilian Grand Prix, he wore an all-red helmet that included the names of his ninety-one Grand Prix victories. At the 2011 Belgian Grand Prix, Schumacher's 20th anniversary in Formula One, he wore a commemorative gold-leafed helmet, which included the year of his debut and the seasons of his seven World Driver's titles. During his 300th Grand Prix appearance, at the 2012 Belgian Grand Prix, Schumacher wore a platinum-leafed helmet with a message of his achievement.