Hydrae
Measurements:
| Height | Usable | Head Circ. | Swell Circ. | Max Circ. | Base Circ. | |
| Mini | 5.5 | 4.5 | 3.5 | 4 | 5 | 7 |
| Small | 7 | 5.75 | 4.25 | 5 | 6.5 | 8.5 |
| Medium | 8.5 | 7 | 5.5 | 6 | 8 | 10.75 |
| Large | 10 | 8.25 | 6.25 | 7 | 9.5 | 12.5 |
| XL | 12 | 10 | 7.5 | 8.5 | 11.25 | 15.25 |
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Hydrae was designed and sculpted by Sion (@sionidae on Twitter)
All measurements are in inches and can vary slightly due to the handmade nature of these products.