The Holiday Gift Set makes a great present for bitcoin enthusiasts, with one green chip and one red chip in gift packaging.
This item consists of five sets. Each set consists of two chips, one 25K-bit Bitcoin Chip, which is green in color, and one 5K-bit Bitcoin Chip, which is red in color.
Each 25K-bit chip has a serial number that begins with C, in this format (X is a digit): CXXXXX.
Each 5K-bit chip has a serial number that begins with E, in this format (X is a digit): EXXXXX.