Handmade by DR DHT himself. Carbon steel black painted chain, with a black metal trigger clasp on one end, and a metal black carabiner on the other.
Available in 2 lengths; 2 feet (as shown in photo), and 1 foot if you prefer a shorter chain. 
These are very durable yet lightweight. 
There will be a very limited amount available. I wear this chain as my daily, and I know you'll love it too.