These multi-aspect heads are designed to use our 402 LEDs sold separately. These LEDs come in various colors and they are sold on our website here. These head kits come with photo-etch parts so that you can build them with or without outer hoods around the visors. Also, the visors can be cut off and sanded if you prefer a signal head without them. Please choose which multi-aspect head you prefer from the drop-down option. The heads are designed to fit 0.032" Outside Dimension tubing (masts) with preferred thin-wall Inside Dimension of 0.20" We sell these masts here on our website. Please see the detailed instructions by clicking the instructions tab.