There is a type called a Martingale collar that has a nylon strap with metal loops and a sliding strap or chain that tightens the collar. The nylon collar is adjustable so when the chain pulls tight, you can control how much pressure is applied when the metal loops meet. They also call them greyhound collars because they don't slip off a dog with a skinny head. You can get them at Petco or Petsmart.
Here is a link showing a few different styles.