Good quality rubber, different sizes suitable for various types of glassware. i.e. Test Tubes, Erlenmeyer Flasks, Buchner Funnels and etc.
| Bottom dia. (mm) | Top dia. (mm) | Solid | One Hole | Two Hole |
| 12 | 16 | ✓ | ✓ | |
| 13 | 17 | ✓ | ✓ | |
| 16 | 20 | ✓ | ✓ | ✓ |
| 16 | 21 | ✓ | ✓ | ✓ |
| 19 | 24 | ✓ | ✓ | ✓ |
| 21 | 26 | ✓ | ✓ | ✓ |
| 23 | 28 | ✓ | ✓ | ✓ |
| 25 | 30 | ✓ | ✓ | ✓ |
| 28 | 32 | ✓ | ✓ | ✓ |
| 29 | 33 | ✓ | ✓ | ✓ |
| 31 | 34 | ✓ | ✓ | ✓ |
| 31 | 37 | ✓ | ||
| 34 | 39 | ✓ | ✓ | ✓ |
| 40 | 49 | ✓ | ✓ | ✓ |
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