These are Rhodium PVD skeleton automatic working movement cufflinks. The 18k gold plated skeleton movement is encased in the cage set in Rhodium PVD. The outer metal parts are made of 316 stainless steel with hand made high skill mirror-polishing and no welding trace. CNC with hand made process inlay totally 348 pieces of Hearts and Arrows CZ stones on the cages and 2 Preciosa Crystals on the crowns. In order to ensure more protection, the cage has designed with an innovative device to prevent the movement falling off. Each cufflink has an independent serial number make you easy to distinguish and identify. Each pair come with an individual retro box, a microfiber polishing cloth and an international warranty in the form of a heart shaped brushed polished card. Product has been carefully selected and 100% IQC & QC pass in our own factory before shipment. The diameter is a reasonable 22 mm, weight is 25 grams/pair.