EK Chain 3D 525Z Black/Gold 3D 525Z X 120 BLK/GLD EK ThreeD (3D) Premium Motorcycle Chain is Elegant, Strong, Detailed and Magnificent. It offers the ultimate shape with flexibility and Strength. EK Chain set out to produce a premium chain that was as beautiful as it is strong. An impressive outer plate shape that offers a curved form to reduce weight and increase appeal is connected together with inner plates and pins that feature lightening holes to further reduce mass. QX2 X-Rings have a better wear-resistance and performance than standard QX-Rings by 30% resulting in a chain that puts 1% more power to the rear tire.