** Please note our injectors are for use with the KB collection sand art, if you are purchasing for another brand of sand art this item may not be compatible. **, Include 1 (3ML)Syringe and 2 injector tips (the gage of the injector will be anywhere from 25G-28G and is 1" in length) to remove or add air to your KB Collection Sand Art, We suggest adjusting the air in your KB Collection sandpicture every 2-3 weeks. The amount of air in your sand-picture determines how fast or slow the sand escapes through the air barrier. The more air — the bigger the barrier. This will result in a slower release of the sand. The less air — the smaller the barrier. This will allow the sand to escape more quickly.