Pop Top J-Tubes are manufactured precisely to fit any standard size pre-roll. At 3.75" in length with an opening of .75" in diameter, J-Tubes provide a convenient way for both medical patients and recreational consumers to transport pre-rolls safely and efficiently. Our Pop Top joint containers meet CPSC requirements for child safety and are available in opaque colors. Additionally, the sealed vial increases the shelf life of the product inside immensely! Our doob tubes are made of medical-grade plastic, are BPA-free, and made with FDA-approved materials.