| Specification | Inner Diameter | Inner Height |
| 20mm | 20.3mm | 7.5mm |
Various colors coated 20mm aluminum caps:
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| 20mm blue-purple coated aluminum caps | 20mm orange coated aluminum caps |
 |  |
| 20mm purple coated aluminum caps | 20mm red coated aluminum caps |
 |  |
| 20mm yellow coated aluminum caps | 20mm green coated aluminum caps |
 |  |
| 20mm black coated aluminum caps | 20mm white coated aluminum caps |
 |  |
| 20mm original color aluminum caps | 20mm blue coated aluminum caps |