Can you tell me the weight of this product. How many grams are the sheets?

The recommended printer setting for the Weatherproof Vinyl Laser (LV) is 117-220 gsm. If you'd like to try samples of this with your printer, you're welcome to visit the link below to request a few sheets at no cost. https://www.onlinelabels.com/samples

Can these labels print on a digital press? I am concerned that the heat will melt the material or the adhesive.

The Weatherproof Vinyl for Laser (LV) is intended for laser printers and coated to withstand the heat generated by the fusing units. If you want to try a few sheets out with your digital press model, you're welcome to visit the link below to request free samples. https://www.onlinelabels.com/samples