Mission Alimix Spin Aluminium Stems with Replaceable Tops. Anodised Aluminium Top on a quality Aluminium Shaft Base. Spare Tops available in several colours. Each pack contains 3 Shafts with tops. Length: 37mm, Thread: 2ba Mission Alimix Spin Stems – Spinning Shafts – Black – Short-S0661Mission Alimix Spin Aluminium Stems with Replaceable Tops. Anodised Aluminium Top on a quality Aluminium Shaft Base. Spare Tops available in several colours. Each pack contains 3 Shafts with tops. Length: 47mm, Thread: 2ba Mission Alimix Spin Stems – Spinning Shafts – Black – Medium-S0659Mission Alimix Spin Aluminium Stems with Replaceable Tops. Anodised Aluminium Top on a quality Aluminium Shaft Base. Spare Tops available in several colours. Each pack contains 3 Shafts with tops. Length: 42mm, Thread: 2ba Mission Alimix Spin Stems – Spinning Shafts – Black – Tweenie-S0660