Those to-go cups are the best way to be eco-friendly and still have the good taste of your drink in a ceramic cup on the go. The lid is made of silicone and you can use it in any of your cups that fit on.
 
They are wheel thrown with a different color clay body ( stoneware like porcelain) to have more durability. They have been fired in a high-temperature gas kiln. Glaze with white color inside and raw clay outside.
 
Size approx: tall 4.5", wide 3 1/4"  12 oz
 
Allow for slight variation as each piece is handmade. Oven and Microware Safe, Just avoid temperature shock.
Dishwasher safe but Hand wash recommended.