Be the talk of the town this holiday season by replacing these bulbs in your porch or garage light. Hang a wreath on it like I did and you make a unique and festive holiday statement without all the fuss, fuss and worry. It's a standard A19 shape, an E26 base, and yes, they flash brightly colored hues. Addictive and maybe a little psychedelic, but by no means tasteless. The transparent part is actually plastic, but feels and behaves like glass. I would also like to say that it was a pleasure dealing with DORESshop. They answered my question quickly and politely, the order came within three days of registration. Next year I might just buy more and give them away!