Last year Valve showed off a prototype of their new "knuckles" controllers for Steam VR while now it appears they are getting to the stage of shipping dev kits to VR developers.

If you missed the "Steam Knuckles" prototype from last year, here's a video of it from Steam Dev Days:

These interesting new VR controllers have now advanced where VR game developers have begun testing them for support, in an apparent sign it may not be much longer before Valve makes them a reality for VR gamers.

This Knuckles Quick Start guide is making the rounds today with more details on these controllers. From the looks of it, knuckles should be much more comfortable than the stock HTC Vive controllers (below for reference), so certainly interested in testing out Knuckles in the future.