  We analyze the possibility of hadron Dark Matter carriers consisting of
singlet quark and the light standard one. It is shown that stable singlet
quarks generate effects of new physics which do not contradict to restrictions
from precision electroweak data. The neutral and charged pseudoscalar low-lying
states are interpreted as the Dark Matter particle and its mass-degenerated
partner. We evaluated their masses and lifetime of the charged component, and
describe asymptotics of the potential of low-energy interactions of these
particles with nucleons and with each other. Some peculiarities of Sommerfeld
enhancement effect in the annihilation process are also discussed.
