Features: Make of Coppers which have good electrical conductivity. Shell is make of insulating PA materials. Stackable designs allows for efficient use of space and easy organization. First pass the bare wire through the gray base. Then through the 2mm plug of the banana plug, then insert the screw from end of the banana plug, tighten the screw, and finally put on shell. Packaging includes: 10Pcs Stackable Shrouded Banana Plugs. Suitable for multiple projects or replacements. Widely used in schools, homes, laboratories and factories. Specifications: Materials: Coppers and PA Diameter: about 2mm/0.08inch Package Includes: 10Pcs Stackable Shrouded Banana Plugs note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.