This tree features MAX 4 Non-Stop Professional Quality Incandescent Lighting:If a bulb or bulbs are removed the set remains litIf a bulb burns out the set remains litEliminates light failure due to misaligned contacts Commercial bulb filament quality and spacing3-year manufacturer's guarantee For any season or all, or for no reason at all, the Seasons 4 Commercial 100 ct. Purple Mini Incandescent with Green Wire and 5.5 in. Spacing - Case of 24 are always a good idea. A great, easy way to illuminate your indoor event or outdoor party. Note: if a bulb burns out or one is removed, the set will remain lit. This eliminates light failure due to misaligned contacts.