Octopus (Nuus) design by artist Ernest Swanson (Haida). 12oz high borosilicate glass mug. Commonly known as ‘laboratory glass’, the borosilicate glass found in Native Northwest Double Walled Glass Mugs will ensure that you can pour boiling hot water without fearing cracks or shatters. This ultra high-quality glass is often found in high-end restaurants, laboratories, and wineries.