This is a limited-availability Sister Link Bracelet. The cord is a blend of grey and red polyester, which I made for a custom order. I do not intend to make more of this specific style, as the color work was crazy-fussy! It is made using the same technique as the polyester plait splice variants, except for the thread being new-stock instead of recycled. That product description is in italics below.
The one pictured here, with the shibuichi clasps, is between a size medium and a size small, and perfect for a 6" wrist, +/- 1/8". If you prefer a looser or tighter fit, +/- 1/4". I only have this one. To order it, select the "ready to ship" option from the drop-down.
I also have enough cord to make another in your choice of size. I only have enough extra cord to do one custom size like this. Select the "Custom Size" from the drop-down to claim it. I'll contact you to work out the size details (it could be a 18" - 20" necklace at the same price....), and you will have the option to use brass clasp (you would get a small refund) or silver clasps (I'd send you a bill for the mark-up).
Inspired by the links of an anchor chain and the innovation of marlinespike ropework. Sand cast by hand from a 3D printed master. The sides can pass through each other when the slots are lined up precisely perpendicular. When I was a kid my father first showed me how to make this kind of mechanism using bolt cutters and chain links. The cord is first hand spun in-house using polyester thread remnants left from the creation of Soft Shackle bracelets. It is spliced by yours truly using an original approach that creates a braided effect. This piece is fine to wear in the water and is intended for continuous wear. It will fade somewhat over time, and may stretch slightly.