Yellow punches for binding, models GP-30 and GP-26/30. - Model Name: Gauge Punch GP-30 - Punch Name: GP-26/30 - Color: Yellow - Material: Plastic - Function: Binding punch My daughter used this in the past, but the frequency of use was low, and I think it's relatively clean. However, please understand that this is a used item. ※ You can also find instructions on the internet, but 　 I've included simple illustrations in photos 5-7. Thank you for looking.