From the construction point of view, they have the same components but, on the small surface of the trapezoid, they have some transverse grooves, which lead to the increase of the belt elasticity when winding on pulleys, reduce the bending tension and increase the contact surface of the flanks.

Optibelt RED POWER 3, BLUE POWER and SUPER E-Power have increased power transmission capacity.

The symbolization of the XPZ, XPA, XPB and XPC belts is done by indicating the profile followed by the datum length Ld (length measured on the cord).