This kind of knife sharpener is designed for portable and sharp feature. It is suitable for all kinds of dull knives and is a good helper for having a quick and sharp cut. 

Features:

• Tungsten steel blade & ABS material
• Make your knife quicker
• With a strong suction pad 
• Safe & easy to use
• Durable & portable
• 6 cm x 5 cm
• 188 g