Reminiscent of beakers, the Colin Carafes are made of high-quality hand-blown glass, so they contain the slight differences associated with that art. The thick glass further attests to their quality, and pouring is a breeze. Colin Carafes are available in three sizes, small (2.5 x 4.5; 8 ounces), medium (2.5 x 6.5; 12 ounces), and large (4.5 x 10; 64 ounces). Hand washing is recommended.