They are 37mm X 27mm across and 3mm thick. They are made from Rhodium Plated Sprung Steel. When I come across good quality findings at a good price, I like to make them available to my customers.
This listing is for 4, let me know if you would like more or less. This link will take you to more KEY RINGS here in my Etsy shop: http://www.etsy.com/shop/UnkamenSupplies/search?search_query=key+rings&search_submit=&search_type=user_shop_ttt_id_5613242&shopname=UnkamenSupplies