Black Titanium ring core, brushed top and polished comfort interior. Note : some are heat treated and some are Unetched finish and  will need to be Heat treated and / or acid etched to reveal the pattern / color. 

8mm total width, Approx. 2.4-2.7 mm thick , Comfort fit interior

Flat top with no inlay groove, perfect for ring makers wanting to customize the channel to any requirement. 

No need to make the core from scratch, all that's required is  a channel and a little finishing afterwards and these become custom cores.  

Black Titanium and sizes 4-20 available 

For 2mm customizable cores click here

For 4mm customizable cores click here

For 6mm customizable cores click here

For 10mm customizable cores click here