BK-MEDENT produces various sizes of zirconia blocks for milling: BK Blank 20 (20mm wide x 14mm long x 14mm high), BK Blank 40 (40mm wide x 19mm long x 16mm high), BK Blank 65 (65mm wide x 25mm long x 18mm high), and BK Blank 90 (95π circumference x 14mm high). The blocks follow FDA, CE Mark, and Korean GMP requirements.