Cards designed to the original specification (PCMCIA 1.0) are type I and have a 16-bit interface. They are 3.3 millimetres (0.13 in) thick and have a dual row of 34 holes (68 in total) along a short edge as a connecting interface. Type-I PC Card devices are typically used for memory devices such as RAM, flash memory, OTP (One-Time Programmable), and SRAM cards.