Sometimes placements are tricky. Different crags throw up shallow cracks, off-width cracks, 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.

Size 1
Strength: 4KN
Weight: 9.4g

Size 2
Strength: 5KN
Weight: 9.7g

Size 3
Strength: 5KN
Weight: 10.1g

Size 4
Strength: 8KN
Weight: 16g

Size 5
Strength: 8KN
Weight: 18g