Sometimes placements are tricky. Different crags throw up shallow cracks, off-width cracks and old peg scars, all of which are hard to protect with conventional nuts. Peenuts offer an excellent alternative; they have a tapered profile allowing them to fit where a regular wire won't seat.
Hot forged to maximize strength and weight
Color coded in a size-for-size way with wallnuts (i.e. Silver size 3 Wallnut = Silver size 5 Peenut)
Label is positioned upside down so you can confirm the size more easily when the units are hanging on your harness