LP Jam Blocks® are the modern versions of the age-old wood blocks that were fragile and could not stand up to the rigors of aggressive touring. Crafted from LP's exclusive plastic formulation, Jam Blocks have the rich tone of wood blocks and the strength and durability to withstand even the hardest-hitting players. Each Jam Block comes with a heavy-duty mounting bracket and LP's famous eye-bolt assembly for easy mounting to any 3/8" diameter rod. Choose high pitch (blue) or low pitch (red).