The insulators are composed of ceramic parts and upper and lower metal attachments bonded together with adhesive. The contact areas between the ceramic parts and metal attachments are padded with elastic washers. The bonding sections of the ceramic parts feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-torsion. The ceramic surface is evenly coated with white glaze, and the metal attachments are painted with gray magnetic paint. The main structure of the ceramic insulator body has two types: a hollow partition (penetrable) structure and a solid (non-penetrable) structure. The bonded pillar insulators are generally of the solid non-penetrable structure, which reduces maintenance and testing work compared to the previous structure. The ceramic insulator bodies come in two shapes: with multiple or fewer棱. The multi-棱 shape increases the surface distance and has better electrical performance than the fewer-棱 shape. All products except for the gradually being phased out external bonded pillar insulators are of the multi-棱 shape. The internal bonding structure, where the metal attachments are glued into the ceramic holes, increases the insulation distance and improves the electrical performance, while also reducing the space required for installation. However, due to the negative impact of internal bonding on mechanical strength, insulators with higher mechanical strength requirements should use the bonded joint structure (i.e., the upper attachments use internal bonding, and the lower attachments use external bonding).