The mainly capacity for gel tube is 10ml to 20ml,diameter 16/19/22mm.Most of them have a nozzle or dropper tip which is convenient to apply the gel on skin or somewhere else.We have different tips to meet clients' request such as acrylic dropper gel tube, PE Plastic Dropper gel tube, long nozzle gel tube,short nozzle gel tube,seperatable nozzle gel tube ete... Other caps also available.We can custom the tube with your design,the capacity,color,printing and cap all can be customized.5-layer is the most used for medical gel because of the better gas barrier properties that can protect the gel from being polluted.