One size fits most - made with bendable metal.
First Few photos are examples of how you can wear them.
#1 - Black Cord with Peridot and Blue Lace Agate crystal chips
#2 - Dark Red Cord with Citrine and Smokey Quartz crystal chips
#3 - Earthy Green Cord with Larimar and Amethyst crystal chips.
#4 - Black Cord with Chakra stones- Clear Quartz, Amethyst, Sodalite, Rose Quartz, Citrine, Carnelian and Tourmaline with a quartz point.
Colours may vary slightly from photos - its tricky capturing their true beauty.