Bright Aluminum jump rings made from a high purity solid Aluminum wire.
The gauge wire used for making all our rings is measured in SWG (Standard Wire Gauge).
Excellent resistance to oxidizing (the dark grey powdery look other aluminum jump rings gets over time).
Each size has an approximate rings per order count, so ordering 1 of that size will get approximatly that many rings (sold by weight) for example 1/4 18g says approximatly 405 rings per order so ordering one will get you 405 rings, order 2 and 810 rings and so on.
The gauge of the wire referes to the thickness. 16 gauge is a thicker metal then 18, and 18 thicker then 20.
AR = Aspect Ratio , more about AR at: http://americanchainmail.com/index.php?main_page=page_2
ID = Inside Diameter