These Czechoslovakian glass hearts were hand-made in molds during the 1980s and early 90s. These heart are opaque black. Each heart can accommodate up to a 0.5 mm cord. They would be perfect for earrings or small charms. These hearts are 7 mm from hole to hole and 7 mm across the widest point. They are 3 mm thick. Price is for 10 beads.