These dwarf signal lights are absolutely the best quality signal lights you can buy in N scale. The mini LEDs glow brightly to signal Through or Stop. No wires show on the layout. The solid painted brass body is nigh unbreakable. The 2 positive leads have resistors attached. To age mine, I simply wiped it with steel wool to remove some of the black paint. NJ International is the way to go for all your N scale signal needs. The only drawback I can think of is availability. Believe me, the wait is worth it. Do no settle for less.