This Pack of 10x Glass T8 LED Tubes are single side powered and they have SMD2835 light sources. They come in a translucent cover and have a rotary head. What stands out is that they can be connected directly to the mains, removing the residual consumption of ballasts and starters, allowing for greater durability and less maintenance. They offer instant, full light, don't flicker, make no noise and are shock resistant. *Special Packaging: This product is covered with adapted protective foam, and then placed inside cardboard that is highly resistant and has extra-tough ends. *Installation not recommended in closed fixtures. *T8 LED Tube Installation Guide