| Property | Specification |
| Color | Light brown to yellow skin; white or yellow flesh |
| Odor | Neutral, earthy |
| Taste | Mild, starchy |
| Moisture Content | 75% – 80% |
| Size | 4 – 10 cm diameter (varies by grade) |
| Texture | Firm, smooth to slightly rough skin |
| Foreign Matter | 0.5% max |
| Sprouting | Not permitted (for fresh grade) |
| Purity | 98% – 100% |
| Storage | Cool, dry, dark, well-ventilated place |