Application(mm)：Band(mm)：Part Number
| Application | Band | W1 | W4 |
| 5-7mm | 6.0 | TwoEar W1-7 | TwoEar W4-7 |
| 7-9mm | 6.0 | TwoEar W1-9 | TwoEar W4-9 |
| 9-11mm | 6.5 | TwoEar W1-11 | TwoEar W4-11 |
| 10-12mm | 6.5 | TwoEar W1-12 | – |
| 11-13mm | 6.5 | TwoEar W1-13 | TwoEar W4-13 |
| 13-15mm | 7.0 | TwoEar W1-15 | TwoEar W4-15 |
| 14-17mm | 7.0 | TwoEar W1-17 | TwoEar W4-17 |
| 15-18mm | 7.5 | TwoEar W1-18 | TwoEar W4-18 |
| 17-20mm | 7.5 | TwoEar W1-20 | TwoEar W4-20 |
| 18-21mm | 8.0 | TwoEar W1-21 | TwoEar W4-21 |
| 20-23mm | 8.0 | TwoEar W1-23 | TwoEar W4-23 |
| 22-25mm | 8.5 | TwoEar W1-25 | TwoEar W4-25 |
| 23-27mm | 8.5 | TwoEar W1-27 | – |
| 25-28mm | 9 | TwoEar W1-28 | – |
| 28-31mm | 9 | TwoEar W1-31 | – |
| 31-34mm | 9.5 | TwoEar W1-34 | – |
| 34-37mm | 9.5 | TwoEar W1-37 | – |
| 37-40mm | 10 | TwoEar W1-40 | – |
| 40-43mm | 10 | TwoEar W1-43 | – |
| 43-46mm | 10.5 | TwoEar W1-46 | – |