Blades with non-replaceable fibre optics stainless steel design with break-proof plastic socket, same service life as for metal design the light guide is not replaceable fibre optics Ø 3.0 mm / 3000 single fibres minimum brightness > 3,500 lux / 2.5 V >10,000 lux / 3.5 V environmentally-friendly, economical and cost-effective can be treated in autoclave at up to 134°C - approx. 4000 times in accordance with DIN ISO 7376 maintenance-free