A Swedish-made diamond sharpener in the form of a thin strip, backed with epoxy-based tape. It sticks easily to any flat surface as long as it is free from grease and dust.
Many people like to stick it on a knife sheath. Make sure it sets for 24 hours after applying.
Length: 50 mm
Width: 20 mm
Diamonds: 30 micron monocrystalline of the highest quality rating (the coarseness corresponds to 600 grit)