[en] The model of rotating joint oriented strings (RJOSM) is formulated for description of the effective mass spectra of 6-quark narrow resonance containing ''u'' and ''d'' quarks. The point of departure is the assumption about large dimensions of the studied systems (approximately 2.5 fm). In this case the excitation levels of the systems are determined mainly by the confinement potentials of the V approximately kr² type. The rotation band that gives an effective mass addition of the Msub(rot)=aJ(J+1) type where J - total moment of the system, is constructed for each oscillation level. The obtained spectrum is compared with the data of the np → ppanti π reaction at psub(n)=1.257 GeV/c and with the behaviour of σsub(pp)sup(el). A quite good agreement is observed for these experiments. The predicted resonances have the estimated width of the order of fractions of MeV