Novelty Lights 25 Foot C9 Outdoor String Light Christmas Stringer - Patio String Lights - Intermediate Base (C9/E17) - 12" Spacing - Brown Wire Novelty Lights offers this commercial grade C9 outdoor string light Christmas stringer that is 25' long with 12" spacing and has a 6" lead on both ends. Each string has 25 Admiral brand sockets and is UL listed for indoor and outdoor use while being used for Christmas lights, house roofline, or outdoor patio string lighting. This C9/E17 base stringer uses our incandescent or LED C9, S11, or G50 intermediate base globe bulbs which are sold separately. Each stringer comes with a fused 5 amp male plug which makes this product safe for indoor and outdoor use and is connectable end to end with a max run of 75' using a 7 watt bulb. Installation Tips: Patio Use; We recommend using "aircraft wire" to use as support cable for a professional look and if you choose not to use a support wire then you can mount the string at various pivot points depending on your application. Roofline Use; Use in accordance with our all in one clip (ASIN B004TNDB2I) so your C9 bulb points upward and is securely faceted to your gutter or under the shingle. Always mount stringer first then screw in light bulb last.