The Mint produces limited-mintage numismatic coins honouring major national achievements and themes. Though they bear a denomination, they are not meant for circulation, and their actual worth is usually significantly greater than their face value. Crafted of gold, silver or platinum, the Mint's collector coins are individually handled as they enter the presses. A single coin may be struck up to three times to achieve a crisp, flawless impression. Certain coins feature the Mint's proprietary technologies: double holograms, selective plating, colouring or laser enhancement.