Matrix cubes are assembled using matrix shards. There are twelve matrix shards available to each character, three of each color. Matrix shards may be assembled in the assembly chambers on either Coruscant (Republic) or Dromund Kaas (Empire) into matrix cubes. Matrix cubes occupy a relic slot and you may have a maximum of two equipped. At game launch these added a substantial bonus to primary, secondary, and tertiary stats, however later patches have not added additional attributes to matrix cubes and their current utility is almost nonexistent beyond unlocking codex entries.

Matrix cubes may be crafted by selecting available shard colors from the three shard input panels. Once shards have been input the matrix cube assembler can be utilized, and selecting YES will consolidate the three matrix shards into one of the matrix cubes discussed below. 

M2 matrix cubes are the most basic matrix cubes available, with the lowest attribute stats. Characters at, or above, level fifteen are able to equip these matrix cubes.

M3 matrix cubes are the second tier of matrix cubes available, with moderately low attribute stats. Characters at, or above, level twenty-four are able to equip these matrix cubes. These cubes require two yellow or two blue matrix shards to craft.

M4 matrix cubes are the third tier of matrix cubes available, with moderately high attribute stats. Characters at, or above, level thirty-two are able to equip these matrix cubes. These cubes require two red or two green matrix shards to craft.

M7 matrix cubes are the fourth and final tier of matrix cubes available, with high attribute stats, although they are still subpar to current best in slot gear. Characters at, or above, level fifty are able to equip these matrix cubes. These cubes require three of a color matrix shard, and there are slight differences in stats based on if you character is a Force or Tech class which harkens to a time when mastery was divided between four primary stats.