ADV. The M5-1D in-ear monitors are expertly handcrafted using only the highest quality, custom-built components. Each unit goes through a specific set of procedures that includes 3D printing, hand pouring, grinding, laser cutting, sanding, and polishing.ADV. The M5-1D in-ear monitors are expertly handcrafted using only the highest quality, bespoke components. Each unit goes through a specific set of procedures including 3D printing, hand pouring, grinding, laser cutting, sanding and polishing..PZA MORE SPECS