World's Best S.O.B. - Engraved Stainless Steel Boss Tumbler, Funny Coworker Gift, Funny Boss Mug. Supervisor Mug, Boss Appreciation Gift. We proudly engrave and ship all of our engraved goodies from our shop in Ohio! Drinks Stay Hot or Cold: Our double-walled, vacuum insulated stainless steel mugs come with an open port lid and will keep your drinks the temperature you want! The standard lids contain a straw friendly open port drinking hole. Sliding lids and flip top lids are available in our options and add ons section. Engraving is permanent, but it is not recommended for dishwasher use. We DO NOT use vinyl, decals, or wraps on our mugs! Each is powdercoated for extreme durability! The 16oz Pint, 20oz, 30oz, 20oz Handled Mug, 20oz Water Bottle, and 22oz Skinny fit most standard cup holders. Material: Metal.