Questions about iFixit Tesa double-sided adhesive tape (2mm)

The tape is black. It is not transparent.

I don't have precise information on the length of the roll of Tesa 2mm double-sided tape. However, a similar product, Tesa 61395, has a roll length of approximately 25 metres. For exact details of the specific product, I recommend that you consult the information provided by the manufacturer or distributor.