| Size | Outer measurements (mm) | Inner measurements (mm) | Weight (g) | ||
|---|---|---|---|---|---|
| 15mm | ca. 20 x 17 x 2.5 | ca. 14 x 11 | 2.5 | ||
| 20mm | ca. 27 x 22 x 3 | ca. 21 x 15 | 3.9 | ||
| 25mm | ca. 31 x 24 x 3.5 | ca. 24 x 16 | 5.9 | ||
| 25mm strong | ca. 35 x 30 x 4.5 | ca. 25 x 21 | 11.7 | ||
| 30mm | ca. 38 x 31 x 3.5 | ca. 30 x 24 | 7.3 | ||
| 30mm strong | ca. 40 x 33 x 4.5 | ca. 30 x 24 | 13.2 | ||
| 38mm | ca. 54 x 50 x 6 | ca. 40 x 38 | 35 | ||
| 50mm | ca. 62 x 57 x 5 | ca. 50 x 41 | 28 |