Flat Fissure X-Cut HP6 (6), Ash steel burs are heat treated to 750 on Vickers hardness scale (enamel 300) to improve their cutting efficiency. Burs are perfectly balanced to reduce vibration and prolong handpiece life. Sterilisation: Steel burs are supplied ‘clinically clean’ and are recommended for single use only. Dry heat (160° uninterrupted cycle) or ethylene oxide may be used if sterility is required. - Pack of 6 burs