These bracelets are made of parachute thread, using a 10x12mm brass tube as a middle piece. 
You can find a matching necklace from the same paracord collection. 
 
 
PARACORD is a collection of necklaces and bracelets made of 100% nylon parachute thread, a highly resistant and durable material, of 9mm thickness, combined with different terminals, beads, ceramics, steps, stops and closures.
 
 
It does look stunning!