Nano needling is performed using a Microneedling pen - however unlike Microneedling, the usual needle cartridge is swapped out for a Nano Needling cartridge. 
Nano needling cartridges are silicone tipped & are gentler on the skin. This is because Nano Needling only penetrates the skin to a 0.25mm depth & is designed to exfoliate the skin & stimulate cell turnover, rather than to penetrate deep into the dermis as Microneedling does. 
When the silicone tipped pins gently touch the skin, they create thousands of Nano channels, which allow your skincare products to penetrate deeper & have a greater effect on the skin. Within 15 minutes after Nano Needling, the Nano channels close themselves. 
This can be had a full facial treatment to improve product absorption or as an add to any facial to specific areas such as the upper lip or the sides of the eyes etc...
The "Upper Lip" Facial option is a great treat, or add on, for "Smokers Lines" & results are usually seen after 4-6 treatments.