I saw this question and response on the T-Glase page at Amazon:
Q: Is this petg or abs? the title says petg, but the "material" says abs.
A: This is a PETG filament.
By taulman3D on February 25, 2019

But they've changed "material" to PETT. I've sent them a question asking what the difference is between PETT, PET, and PETG.