The Steel Slit Shape (SSS) considered in this paper were tested as part of a wide experimental campaign including other devices, such as short link and torsional members, which are not considered herein . Particularly, the results obtained in the tests carried out on six SSS hysteretic devices (three of them made of S355 steel and other three ones made of S275 steel type with equal geometric dimensions are taken into account in the present study. They were designed according to the analytical relationship provided by Chan ]in order to have the same values of yielding displacement δE and elastic stiffness kE. The geometric dimensions of the device (and the slits) realised by conventional steelwork procedures are shown in . The slotted holes had 20 mm diameter for a length of 205 mm, in order to have 4 strips with the following dimensions: width = 55 mm; thickness = 10 mm; depth of the part with constant cross-section = 185 mm .