Television closed route engineering line oxygen free copper four shielding double aluminum foil double layer net foot 100 meters

Indoor oxygen-free copper 500 eight-core high home improvement project high-speed network line feet 300 meters

Crystal head jumper Oxygen free copper six shielded jumper High speed network six twisted pair jumper

Two-core telephone line Pure copper engineering voice telephone line landline Connection cable Two-core twisted pair cable

Red and Black Parallel Lines

Tunnel digital tube double copper core line Mine tunnel operation extension line mine mining signal connection line