High‑purity monocrystalline sapphire (Al₂O₃), base crystal orientation C‑plane (0001), extreme dual‑direction off‑cut: 10° toward A‑axis (11‑20) and 10° toward M‑axis (10‑10). Epi‑ready polished wafer with strict tolerance on miscut angle, TTV, bow, warp and surface roughness. This ultra‑high dual‑miscut substrate generates ultra‑dense atomic‑step arrays, promotes step‑flow epitaxial growth, suppresses 3D‑island nucleation and reduces threading‑dislocation density. It is a research‑only wafer, not suitable for mass‑production LED fabrication, and ideal for advanced‑grade AlN‑template research, deep‑UV optoelectronic devices, UVC‑LED, ultraviolet‑laser‑diode process exploration and novel functional‑film deposition. Single‑side / double‑side polishing and customized thickness are available.