| Model | Capacity | Peak |
|---|---|---|
| HFE-A1-05 | 500 cc | Stiff Peak |
| HFE-A1-025 | 250 cc | Stiff Peak |
| HFE-A1-05/P | 500 cc | Flexible Peak |
| HFE-A1-025/P | 250 cc | Flexible Peak |



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