The standard EPOC Flex cap follows the official 10-20 system and has 72 openings as shown below. The cap has two pockets for securing the controller into the cap, one is fitted below Cz and the other Iz.
10-20 sensor map
The caps can be ordered in standard sizes are 54, 56 and 58 cm in a black high comfort material. Other sizes in 2cm increments, hole positions, materials and cuts are available please contact online support for further information.