The EV-7 Telos is a fantastic putter that fits right in between the Penrose and the Phi in terms of stability. This disc has the flat top like the Penrose, but the beadless bottom like the Phi. This is an excellent stability for an all purpose disc golf putter and will help you find the green and make more putts. 
The Telos is available in all of the outstanding EV-7 premium putter blends.