From the manufacturer

Energy Flo acupuncture needles are manufactured exclusively for Acu-Market™. We spent years designing these needles to be super smooth and consistently superior. Energy Flo's are made by computer automated machinery to provide a uniformity and consistency only previously available in a select few brands.

Energy Flo acupuncture needles are plastic handled and are attached to an individual guide tube using a special glue that bonds the needle shaft to the guide tube and can be quickly released by twisting the needle shaft to release the glue bond with the tube.