... SUS304 stainless steel , which inside and outside. Our stainless steel beer barrel is made of SUS304 stainless steel , which inside and ... outside, with PU thermal layer and two beer pouring tips, upper tip and bottom tip and the outer ... are 2L, 10L, 15L,20L, 25L, 30L, 50L. And we can design the keg according as client's demand.