The Card Holders are made from chrome tanned cowhide to make the material strong and dehydrated, and press wrought to permanently remove the water content. The leather of this card holder is then neutralised to remove any possible sources of acidity in order to be fed with 30% fat to bring suppleness and resistance, it is then dyed and dried. The last stage consists of finishing the material, satin-finished and dry-milled, the leather is softened again to be shaped and sewn into the Card Holder before the stage of placing the 4 magnets and closing.