These jump rings are made of anodized aluminium and are sold in bags of 100.  The latest batch of these are a deep gold and different from previous colours - please be aware
This size is perfect for use with LARGE scales
 
The wire thickness is 1.6mm and are available in a avariety of sizes - we measure the internal diameter (for example a 5/32 size will have an internal diameter of approx 4.1mm)