Our X-Head cylinder guards for 2005~2009 model R1200’s have been in the line since Spring of 2009 and have evolved over 3 generations of improvements. The first production lot was molded in a material that proved not to be robust enough to last over time. They can be identified by the letters <PC PBT> engraved on the inside. If you have a set that has cracked even without taking an impact, we will replace it at no charge with our newest version v.3. The latest product is molded in a different engineering polymer that withstands much higher heat and impact force.