It made by stainless steel, We need wash more time, use Liquor and Spirits wash this flask.ELEGANT VERSATILE - The 8 oz flask brings and stores more your favorite beverage. Idea stainless steel flask for all outdoor activities, like Fishing, Camping, Boating, Hunting, Hiking, Tailgating and much more.100% LEAKPROOF - Every whiskey flask with thick stainless steel lid, air-pressured, laser welded and quality controlled. The cap seals tightly to make sure no vodka, whiskey, bourbon or other favorite beverage will leak out and get wasted.WORRY FREE 2 YEAR WARRANTY- 100% Guarantee If you are not completely satisfied, contact us immediately .Great, Its a bit hard to fill, but we have a funnel. The leather on the sides make it so it doesnt get too cold, as well as differentiating it from somebody elses flask.