  Gas electron multipliers (GEMs) with wire (WGEMs) or metal electrodes
(MGEMs), which don't use any plastic insulators between the electrodes are
created. The absence of plastic insulation between the electrodes of WGEMs
excludes unwanted leakage currents and spark breakdowns between the electrodes.
Accidental spark events in such MGEM don't lead to their failure as far as
positive ions quickly move away from the breakdown region by a strong electric
field in the gap region. In this work, we present a review of such GEMs. The
chambers containing MGEMs (WGEMs) with pin-anodes are proposed as detectors for
searching of interactions between Dark Matter particles and hydrogen (H2). In
this paper, we present a review of such chambers. For investigation of the gas
mixtures (Ar+10% H2, Ne+10%H2, H2 +3ppmTMAE), the chamber containing WGEM with
pin-anodes detection system was constructed. In this paper we present the
results of an experimental study of these gaseous mixtures exited by an alpha
source. Finally, we discuss principles of operation of GEMs with pin-anodes as
well as plans for constructing of large scale (150 mm x 150 mm) MGEM detectors.
