Thumler's Tumbler are made in Oregon I believe and are steel .... heavy duty as designed for ROCKS...
They are very good but $$$...da bomb "if" you do 15 LBS at time ?
Lyman' s and the similar , RCBS , Hornady , and Frankford Arsenal are made in Asia in plastic... they are OK
and have user friendly screw off lids , some what better & easier for brass turning.
> But they all, wreak a $200 bill all to heck...
Something to look into, Harbor Freight has clone of Thumler's Duel Canister $158.60 Tumbler (see photo )
with coupon HF's is $35 BUCKS ! and for $5 more get the warrantee , free replacement if need be !