Pre-sterilized. Each head has seven 0.8 diameter x 2.4 mm long needles. 5.7" (145mm) long flexible handle made of bull horn.
Comes with 13 extra disposable heads. Flexible plaster hammer with 13 replacement heads individually packaged and sealed. Comes with 2 pieces of special designed smart wrenches for replacing used heads to avoid skin contact with used needles.