The Tapered Plug For The 30 oz Yeti Cup Are A Hollow Plug Made Of High Temp Silicone Good To Temperatures Up To 600 Degrees F. For The Purpose Of Powder Coating The Yeti Without Any Wrap Around Leaving a Professional Finish Every Time. These Plugs have a 3.250 Bottom Diameter, A 4.000 Top Diameter And Are 1.500" Long