The Lagerhead Black & Tan Turtle is a formed piece of stainless steel shaped like a snapping turtle which fits over the rim of a glass - you can pour your stout over the "shell' of the turtle, creating the perfect Black and Tan drink.  The mouth doubles as a bottle opener.  You can also use it to make other delicious layered beers.  It measures about 5.5 x 3.25 x 1.75" tall.  Markings resembling a turtle and its shell. Identified on bottom including patent # on bottom D470370.  It is in very good, clean preowned condition.  We are a smoke free home.