Model number QY-4 Material: TPR ring 550 steel plate (manganese steel) Quantity: one pair of two packs (packed in PP bag) Colour: Black Weight: L code 190g M code 180g Suitable for shoe size: M code: suitable for 34-40 yards shoes Men's 40 yards recommendation is L L code: suitable for 40-45 yards shoes The system classification can't be edited. Features: With a variety of sports shoes, hiking shoes and mountain boots, suitable for ice, grass and other environments, suitable for outdoor mountaineering