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Be the envy of your friends and coworkers with these "Limited Edition Insulated Tumbler " ---- Klein Tools' MBB00015 SS Slim Double-Wall Stainless Steel with Copper Vacuum Insulated Tumbler with clear push-on splash proof lid, holds 20oz. Sporting the iconic Klein Tools lineman's historic coined black logo. The vacuum insulated body and copper plated inner wall help retain the internal temperature of the tumbler longer (Hot 8 hours; Cold 16 hours). The copper plated inner wall can make a difference of 9° F / 5° C over 24 hours and prevents hot from entering or eXiting the tumbler by thermal radiation. American designed.