Cufflinks by Helen Rankin The Sync cufflinks feature tiny rhythmic angles and texture. These have an oxidised finish with a contrasting silver surface to expose the pattern. Features Primary Material : silver Fitting Type : hinged bar Dimensions (mm) : 10x10 One of a Kind : No Metal : silver Hallmarked : No Cleaning InstructionsWe recommend storing your jewellery in a zip lock bag as exposure to the air and environment can cause your jewellery to tarnish over time. Zip lock bags are a cheap way to keep your jewellery looking newer for longer. Acid free tissue is also an excellent way to store your jewellery. To brighten up your silver pieces we recommend using a silver dip solution. Always ensure you clean your item after silver dipping, with warm soapy water and a soft toothbrush. If your piece is partially oxidised we advise cleaning the bright silver areas only by rubbing with a silver polishing cloth. For gold plated items, you can use warm soapy water and a soft cloth to remove any dirt however it will not bring back any shine of the original plating. We would recommend a re-plating of your item if you want to give it its sparkle back.