The Protektor earring back uses an internal spring lock to secure the back into place.

Squeeze the two side buttons together to release and slide on/off.

Important - pricing is for one (1) back...if you want a pair, you will want to order quantity two. 

Additionally, these backs require their own earring post.  These backs will not work on earrings unless they have the Protektor posts...thus, you cannot use these backs on screwback or other earrings.