Green & yellow inspired by Oakland A's colors, bit lighter and yellow not golden.

Size ~11 seed beads.
Yellow - very old Czech
Green - smaller ~12/0 - Maybe Japanese-fairly regular in size & shape.

For doing the DNA spiral ropes, the core bead should be the same size or larger than the exterior beads.

DNA Spiral Rope that I 1st believed appeared in Beadwork magazine & Jean Campbell's Beadwork Magazine book Beaded Cords, Chains Straps & Fringe

Fusion Beads instructions: http://www.fusionbeads.com/Spiral-Rope-Chain