All Plasma Pen stainless steel nano-probes are unique to our device, screw-in, adjustable and made of the finest materials. Probes come in packs of 10 and each sterile nano probe is individually and hygienically sealed with a unique lot and expiry date. All nano-probes are disposable and designed for single-use only i.e. one probe is to be used per patient per treatment session. The two length sizes (short and long) represent the length of the probe with the choice based on personal technician preference. This option is the short version. All probes can be bent/adjusted at will for precision treatment. Probes are always inserted in a clockwise fashion at the top of the device. They should not be over-tightened.