now controls these hand pieces okay so these go into your slow speeds now there's different types of controls so for example this has a blue bunt which means it's one to one okay you have like the green bound at the bottom which is it speed reduction and also red band would you speed increasing there's a four different companies like surgical entangles and also prophy come triangles main things to make sure is that you are lubricator just as regular as you lubricate your turbines