Friction Idiophones 
Idiophones which are rubbed, for example the nail violin, a bowed instrument with solid pieces of metal or wood rather than strings.
Friction sticks 
- 131.1 Individual friction sticks.
- 131.2 Sets of friction sticks.
- 131.21 Without direct friction.
- 131.22 With direct friction.
Friction plaques 
- 132.1 Individual friction plaques.
- 132.2 Sets of friction plaques.