Features: This knife sharpener works great on all types of knives. Keep your knives sharp and ready to use. It is very easy to use, and very sturdy and durable. How to use: 1. For scissors: Use stage 1 by opening the scissors and inserting them into the slot. Steadily hold the sharpener and sharpener for 5-7 times. 2. For steel knives: Place the knife in stage 2 and sharpen 3-5 times towards you only. Repeat in stage 3 and 4 for a more defined finish. Material: ABS plastic+ TPR 4 stage slot material: Ceramic+Tungsten steel+ Diamond Contact us: Please contact us if you have any issues or need any additional help. We are more than happy to help our customers.