Cosmo fit Shaft Gear. Evolution of the Fit Shaft, the Fit Shaft Gear uses a polycarbonate resin to strengthen the stem at both the screw threa and base of the top. The spinning type still sports the rounded top, while the locked type has changed to a flat shape to help tell them apart. Available in 8 different lengths.
Each pack contains 4 stems. Thread: 2ba
| Size | Length | Equivalent |
| #1 | 13mm | Extra Short |
| #2 | 18mm | Short |
| #3 | 24mm | Tweenie |
| #4 | 28mm | |
| #5 | 31mm | Medium |
| #6 | 35mm | |
| #7 | 38mm | |
| #8 | 42mm |