100% acrylonitrile for life long use. New innovation that makes it possible to mount a dartboard to the backboard without any rotation of the dartboard while playing. The dartboard will be able to be turned 10 times, so it makes it ultimately simple to rotate to the next treble. Each of the 10 sides of the fixing plate corresponds to the black segments on the dartboard. Your are still able to use a dartboard surround when using this unique bracket system. Proper use of the dartboard fix will extend the life of your dartboard and each DartboardFIX comes with instructions on the box.