Vegrandis, LLC has launched the microarray of self-contained microelectrochemical cavities on a chip in the market.  These microarray chips are available in  VEG4X1^TM and VEG4X1^TM arrays. Other sizes can also be custom fabricated using customer specifications. Each microcavity has a bottom recessed microdisk electrode (2 x 10³ μm²), the middle tubular nanoband electrode (8 μm²) embedded on the cavity wall, and the top/rim electrode (7 x 10^-3 cm² for 200 nL solution).