These solid copper pennies are designed to accentuate the Indian head penny sillouette by leaving the rim of the coin. US Indian head pennies circulated in America from 1859-1909 (years on cufflinks will vary). You know the measurements of these cufflinks already...penny size! Each pair has sterling silver cufflink findings soldered onto the penny. The backings are strong, hinged findings that will not pull through your cuffs!