C-7 & C-9 Solid Ceramic Blue Christmas Light Bulbs. Replace your old bulbs with a set of brand-new Candelabra Lights. What's the difference between Twinkle and Steady? Twinkling bulbs have a filament inside the bulb that when heated up by the socket, breaks apart and causes the illusion of a blinking/flashing/twinkling light bulb. Steady Bulbs stay on continuously while plugged in. No flashing on and off. Bulb Specs: C-7 (E12) or C-9 (E17) brass base sockets. For more information regarding the difference in size, click here C7 - 1.5in long X .825in diameter C9 - 2in long X 1.125in diameter Screw-In Replaceable 25-50 Light Bulbs per order, each box contains 25 bulbs Solid colors - Ceramic Bulbs are painted in solid opaque colors. Incandescent lighting glows through the colored bulbs. Color while on is brighter than when bulbs are off Candelabra Shaped - They look like sparkling candles in the night! Incandescent Lighting - Warm Glowing Bulbs 7-Watt, 120 Volt Rated over 10,000 hours Indoor/Outdoor - Water-Resistant & Weather-Resistant All bulbs are checked prior to shipment in good working condition. C7/C9 Orders shipped in a padded envelope. For orders of C9 or 2 or more C7, orders shipped in cardboard box 8X8X8in. Match your any color of the Holiday Season!