Replacement heads for WELIRY Electric Shavers.（Applicable Model：BY-1750,BY-1760） The three comfort cut blades closely fit the undulations of the face, protecting the skin from cuts and while keeping the beard growing in various directions from the root, it provides a comfortable deep shave. Usage steps: Open the head of the electric shaver, pull it out with a little force, and replace it with a new replacement blade. After installation, put a drop of oil on each nozzle and run for 10 seconds to get the best experience. It's recommended that you replace the shaving head every 12 months to get the max shave performance. Easy to remove and reinstall the shaving head, you can reset your shaver in just 2 minutes. （This shaver replacement blade is only applicable to Weliry brand shavers） This electric shaver replacement head is suitable for replacing Weliry shavers, applicable models: BY-1760, BY-1750. （This shaver replacement blade is only applicable to Weliry brand shavers）