All acupuncture cartridges have a bullet shaped point and contain a membrane. 

Needle Diameters: 1 rl acupuncture is a .30 mm (#10). All other acupuncture cartridges are a .25 mm (#8). The #8 cartridges are also called bug pin's or nano cartridges. 

MicroPMU Premium Quality Needle Cartridge.

Each box contains 20 individually wrapped sterile needle acupuncture cartridges.