Package includes: enough replacement mini light bulbs, sufficient for you to replace the broken bulbs on Christmas tree light bulbs and store for a rainy day Size details: the base measures 0.43 inch in length, 0.3 inch of width on inserted part of base, and the bulb measures 1.26 inch in length, 0.2 inch of diameter, please check the specs on your own lights carefully before purchasing Specifications: 2.5 volts, 0.425 watt, 0.17 ampere, Christmas mini incandescent bulbs are made of nice quality material and well inspected and tested by manufacturer, designed for 50, 100 or 150-light bulbs How to replace: first, keep your light set unplugged, and take out the broken light with its base and throw it away, next, check that the two wires of the new bulb are properly positioned on either side of the base (Do not let them cross or touch), then, insert the new light at a right angle and make sure it's pushed in completely, and last, plug the set back in to see if you are successful Applicable occasions: our replacement mini light bulbs can fit for artificial Christmas tree, wreaths and garlands light bulbs well, ideal for replacing existing bulbs that have burn out or grown old; Warm tips: if the plastic housing did not match your light, please use our glass or wire in your original plastic housing