There are teeth on each end of the Snappi that grip onto the fabric of cloth diapers and pull the points to a center. 

Snappis are used instead of diaper pins.

• BETTER THAN PINS: Nobody likes putting sharp diaper pins near their baby. Also, they’re just plain ugly. Snappi nappy clips give your baby some style and are 100% safe. No more steel diaper pins, cloth pins, or safety pins.
• HOW DO I USE SNAPPIS: We knew you were going to ask this, because we have telepathy. Snappi diaper cloth diaper clips can be used with prefold and flatfold cloth diapers.