Are these labels compatible with a Zebra GX420d Direct Thermal printer?

The RL928RD, Removable Direct Thermal, has a 1" core and 4" outer diameter which meets the specifications for Zebra's GX420d printer.

Is this compatible with ZP450 and Eltron CTP2844?

The RL928RD is a 3" x 1" direct thermal label on a 1" core with a 4" outer diameter which meets the requirements for both Zebra printer models, ZP 450 and Eltron CTP 2844.

Can we get these in another color?

At this time we don't offer any colored materials on our thermal rolls. However, if you have access to a laser or inkjet printer, we have a variety of colors on sheets: https://www.onlinelabels.com/materials

Hello, is this paper compatible with the Star Micronics TSP654IISK Sticky Label Printer?

We have not tested this printer model with our materials. Reviewing the printer specifications on Star Micronics' site, this model is specifically for use with liner free adhesive labels. Since our labels include a liner (backing material), they would not likely be compatible. We'd recommend reaching out to the manufacturer to confirm. You can also request free samples of our product for testing: https://www.onlinelabels.com/samples