T/C Accessories U-View Powder Flask is a see-through powder flask that makes it easy to monitor your powder supply. This handy device is small enough to easily fit in your pocket or possibles pouch yet it holds enough powder for about a dozen reloads. Spring loaded plunger is easy to control for dispensing powder into a measure. NOTE: Powder measures & flasks are to be used with Black Powder or an approved black powder substitute such as Pyrodex.