Charmilles Part #130003174 (old #449019) Robofil 290, 300, 310, 500, 510, 690; TiN coated Wire Drive Roller for Tim Head without grooves (Left side) 50mm(OD) x 8mm(ID) x 24mm(Thk) Also available extended life version, lasting 30%+ longer #SPK-C005-1L