The XTRM SNFFR Double Large Poppers Booster Cap by XTRM takes the use of poppers to a new level. You unscrew the original cap from the manufacturer and screw the Booster Cap on the bottle. You will quickly feel the difference. Another advantage is that with the Booster Cap you protect your skin from skin irritations and burns, because you have no direct skin contact with the poppers. After use, it is mandatory to replace the original cap from the manufacturer to prevent leakage. Try the Booster Cap and write a product review on this page. The size Large is suitable for all square 25ml bottles from the manufacturer Lockerroom.