Shot Koi Carbon Shafts – with Springs – Michael Smith – Red – Medium. These carbon shafts feature a chevron design. Length: 48mm (excluding thread – 5mm) Thread: 2baShot Koi Carbon Shafts – with Springs – Michael Smith – Red – Tweenie. These carbon shafts feature a chevron design. Length: 41mm (excluding thread – 5mm) Thread: 2baShot Koi Carbon Shafts – with Springs – Michael Smith – Red – Short. These carbon shafts feature a chevron design. Length: 35mm (excluding thread – 5mm) Thread: 2ba