• 1. The 4.0 mm enlarged banana plug is made of grade a brass international standard copper, which conforms to the international production standard. The shrapnel is made of high titanium beryllium copper, with sufficient elasticity, durability and no deformation.
• 2. The plug is plated with 24K real gold with a thickness of 1 μ M. the plating layer will not drop after thousands of times of insertion and extraction. The thickness of the coating plays a good protective role to prevent oxidation and effectively prolong the service life of the plug.
• 3. It has good electrical conductivity and continuous stability.
• 4. The sheath is made of nylon material, which has no smell, good toughness, wear resistance, high temperature resistance and non flammable.

According to the repulsive property of the same-sex charges, the charge flow only occurs on the metal surface. So a thin metal coating is needed. The thickness of the plating layer plays a good protective role to prevent oxidation and effectively prolong the service life of the plug.