A Swedish-made diamond whetstone in the form of a thin diamond coated strip, backed with epoxy-based tape.
It sticks easily to any flat surface as long as it is free from grease and dust.
A very handy way to ensure that you always carry a knife sharpener and can maintain a working edge on your knife while out and about.
Length: 50 mm
Width: 20 mm
Thickness: 0.7 mm
Diamonds: 60 or 30 micron monocrystalline of the highest quality rating.
Translated to grit, this is 300 or 600 respectively.