A popular collar of the "echidna" type, with a chain structure, the links of which are finished with protruding, bluntly ended ends of the wire.
The spikes are set at such an angle as not to dig into the skin.
Both ends of the actual collar are additionally connected by a clamping chain that enhances the training effect.
The product is made entirely of chrome-plated steel.
Adjustable by subtracting and adding echidna eyelets.