Harrows Keramic Aluminium Stems. Manufactured from a hi-tech aerospace alloy with a specific gravity of 2.64gcm3, Keramic shafts give the player unrivalled performance and a sleek and stylish look. Super tough, super strong coated Aluminium shafts . Length: 47mm; Stem Weight: 1.6g; Thread: 2ba Harrows Keramic Stems - Aluminium Dart Shafts - WhiteHarrows Keramic Aluminium Stems. Manufactured from a hi-tech aerospace alloy with a specific gravity of 2.64gcm3, Keramic shafts give the player unrivalled performance and a sleek and stylish look. Super tough, super strong coated Aluminium shafts . Length: 35mm; Stem Weight: 1.6g; Thread: 2baHarrows Keramic Aluminium Stems. Manufactured from a hi-tech aerospace alloy with a specific gravity of 2.64gcm3, Keramic shafts give the player unrivalled performance and a sleek and stylish look. Super tough, super strong coated Aluminium shafts . Length: 41mm; Stem Weight: 1.6g; Thread: 2ba