| Grade | Diameter (max. mm) | Min. no. of 42”long quills per kg | Min. length of quills in a bail | Max. % of single quality quills per bail |
| Alba | 6 | 45 | 200 | 1 |
| Continental C5-SP | 6 | 35 | 200 | 1 |
| C5 | 10 | 31 | ||
| C4 | 13 | 24 | ||
| C3 | 16 | 22 | ||
| C2 | 17 | 20 | ||
| C1 | 19 | 18 | ||
| Mexican (M) M5-Sp. | 16 | 22 | 200 | 2 |
| M5 | 16 | 22 | ||
| M4 | 19 | 18 | ||
| Hamburg (H) H1 | 23 | 11 | 150 | 3 |
| H2 | 25 | 9 | ||
| H3 | 38 | 7 | 60 |
