It's been an extremely slow process with Kerv.
I backed on Kickstarter back in 2015, and communication since has been rather limited.
Last year they went extremely quite while being subject to an IP dispute.
Apparently they've started shipping to backers, but i'm still yet to even receive a 'confirm your order and shipping address' email before they ship.
I'll no doubt get one of the payments rings here once they come out of pre-order, which will probably still arrive before my Kerv rings do.