Optima CLX Seward Blade Infant No. 1 105 (L) x 7mm (H) ISO 7376 fibre optic fitting. Fibre core ‘clicks’ in and out for easy disassembly and assembly. 4mm fibre core, 6500 fibres. Fully autoclaveable. Lifetime guarantee. Clear, concise product labelling. Product Description The Seward blade is similar in application and design to the Robertshaw blade but features a small z-shaped rear profile. The Optima CLX laryngoscope system has been designed to reduce the likelihood of protein deposits remaining after each blade sterilisation, in turn reducing the risk to both operator and patient.