D.I.D never compromises, even for mini bike racing chains. All NZ series has a solid bushing and SDH treatment.

Solid Bush - Cold-Formed High-Precision Bushing:

• Solid Bushing chains have a high wear-resistance. The cold-formed solid bushings have a smooth seamless surface with complete roundness.
• Solid bushing = longer chain life

SDH Pin - Extreme Impact Pin Strength:

• SDH pin treatment creates an extremely hard Chromium Carbide Layer on the pin's surface. But at the same time, the inner core is maintained soft to absorb shock loads of extreme jumps, etc.