ADV. The M5-6D in-ear monitors are expertly handcrafted using only the highest quality and custom components. Each unit goes through a specific set of procedures that includes 3D printing, hand pouring, grinding, laser cutting, sanding, and polishing. This meticulous production procedure requires 4-6 weeks lead time from material preparation to final assembly. Once assembled, each M5-6D goes through a rigorous quality control process by the lead technician, before finally being approved and packaged.ADV. The M5-6D in-ear monitors are expertly handcrafted using only the highest quality and custom components. Each unit goes through a specific set of procedures that includes 3D printing, hand pouring, grinding, laser cutting, sanding, and polishing. This meticulous production procedure requires 4-6 weeks lead time from material preparation to final assembly. Once assembled, each M5-6D goes through a rigorous quality control process by the lead technician, before finally being approved and packaged..PZA MORE SPECS