The self-adhesive MATRIX coin holders are available in white or black. They are made from strong cardstock and have an archival quality liner, which is free of PVC, acids, or chemical softeners for optimum safety. Convenient self-adhesive holders provide hermetic catch and eliminate the danger of harming coins with metal staples. Simply press the coin holder together to activate the adhesive. Holders are writable for better identification. Overall size: 2×2″ (50 x 50 mm).