What is Physical Bitcoins?

Typically physical metal coins (that are designed to look like Bitcoin) that have a private key hidden under a tamper-proof sticker or hologram, physical bitcoins can be purchased pre-loaded with cryptocurrency (or without any). The Casascius Coins were the first popular physical coin that was sold that held bitcoin (BTC). You can purchase other physical coins that support cryptocurrencies like litecoin (LTC) and bitcoin cash (BCH). The physical exchange of these coins is a blockchain transaction because the recipient is now in possession of the hidden private key. Generally, these physical coins are single-use, and once redeemed, cannot be reused.