Our Waterproof Colorful Silicone Stopper is a tapered and small attachment utilized to seal the openings of flasks, test tubes, and different research center glassware items. This is composed of quality silicone that is available in square shape. Notwithstanding, it is best for applications that demand a secured seal or a noteworthy level of concoction obstruction. The basic role of this Waterproof Colorful Silicone Stopper is to keep a fluid or gas from leaking from its compartment amid a logical examination. This can likewise avert the pollution of tests by shielding the substance from air.