Eikon Conventional Polished Spring 13 - 23 

Individual main springs are slotted for easy installation and removal. Designed to work with any conventional armature bar. Made of precision ground polished high carbon spring steel.
Available in thicknesses from 0.013" - 0.023".
Springs are flat and require bending.
Width: 13 mm (0.5")
Length: 33.4 mm (1.3")