Cosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 3 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 3 dark black stems is what is visible when the dart is fully assembled. Shaft length: 24mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 1 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 1 dark black stems is what is visible when the dart is fully assembled. Shaft length: 13mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 2 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 2 dark black stems is what is visible when the dart is fully assembled. Shaft length: 18mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 4 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 4 dark black stems is what is visible when the dart is fully assembled. Shaft length: 28mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 5 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 5 dark black stems is what is visible when the dart is fully assembled. Shaft length: 31mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 7 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 7 dark black stems is what is visible when the dart is fully assembled. Shaft length: 38mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 6 spinning dark black stems have a rounded top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 6 dark black stems is what is visible when the dart is fully assembled. Shaft length: 35mmCosmo Fit Shaft Gear in dark black are made from a polycarbonate resin to strengthen the stem at both the screw thread and the base of the top. These size 8 locked dark black stems have a flat top to allow the flight to rotate and the hybrid stem profile is concave towards the top of the stem, and a wider base where it screws into the barrel. The given length of these size 8 dark black stems is what is visible when the dart is fully assembled. Shaft length: 42mm