BUTTERFLY FREE CHACK PRO is totally FREE of volatile organic compounds and is more viscous compared to the original FREE CHACK. It can increase the dwell time on the blade, resulting in higher amounts of spin. After a drying period of around 15 – 20 minutes it allows you to stick the rubber down onto the blade. This glue comes in a 37ml bottle with 8 sponges for spreading the glue. Note: Please shake before use.