| Natural Carnauba Wax Brings Smoothness Jacket with a jammed zipper? Freeing From Jammed Zipper! 1. Natural carnauba wax brings smoothness Scentless and works on any type of metal and plastic zipper. 2. Easy fluid control and application Designed with a spring-loaded mechanism for easy fluid control, and features a soft-felt pen tip that allows for easy and accurate application. Also, the pen type adds to the convenience of product usage. 3. Transparent body pen-type design With the transparent body, you can easily check the liquid volume at any time. CUSTOMER REVIEWS ✧Super easy fix "I had 3 different boot zippers that were not going up and down. In under 5 minutes had all 3 gliding smoothly."