Aluminium sling rings in two sizes (medium and large) and four colours (bronze, gold, slate and silver). These are purpose made by slingrings.com; in stock and shipped to you from within Australia.
Medium sling rings are ideal for medium weight fabric, in widths of 65-80 cm. The rings have an inner diameter of 6.5cm and outer diameter of 7.5cm.
$8.00 per pair.
Large sling rings are good for heavier weight fabric or two layers of lighter fabric. They have an inner diameter of 7.5cm and an outer diameter of 9 cm. If you are using a heavy weight (winter weight) or heavy nap fabric, a very wide fabric(80cm-115cm/30"-45"), or have had difficulty adjusting your sling in the past, these would be best for you.
$9.00 per pair.
Colours from left to right: bronze, gold, slate, silver.
How to sew a variety
of slings yourself:
Jan Andrea's Baby Related Crafts
And did you know you can make no sew slings using a pair of sling rings? Here are some links that you may find helpful.
Sling rings can be used to simplify a number of wraps,
especially back carries. See Dallas's
brilliant roundup for tibetan, shepherd's carry, double
rucksack carry and backwrap cross carry - with pictures and videos of
to do it yourself.