The BladeRunner and Maverick come standard with a “Sustainium” tone block. We also offer solid brass, solid carbon steel and a shorty Sustainium block for thinner body guitars. The additional style blocks are designed for use with the BladeRunner and Maverick. They can be ordered through the Custom Shop as part of a BladeRunner build, or individually to swap out yourself. All standard blocks are 1.7” (43mm) tall and the shorty block is 1.5” (38mm) tall.