Is this a 510 thread screw on.

Yes! The Slim Oil Vape Cartridge is a 510 thread screw on cartridge

What is resistance

The Regular cartridge is 2.4 Ohm and Glass cartridge is  1.9 Ohm.

Does this cartridge work with the SlimOil 2.0 like the glass cartridges do?

Yes as long as you use the magnetic adapter that came with the Slim Oil 2.0.

How do you fill these?

1. Unscrew the mouth piece 2. Pull the mouth piece off 3. Fill with your oil 4. Replace the mouth piece 5. Screw together the cartridge

How many ml does it hold?

This cartridge holds 0.5 ml