idk what gauge all it says is 316 L surgical steel but I haven't made mine bigger than the original size and I have the same exact ones different images
If you put them on a measuring tape, and the diameter of the bar measures between 2 millimeter lines exactly then that is .81 millimeters and is a 20 gauge. If the bar diameter of the jewelry covers both millimeter lines then that is 1.0 millimeters and is an 18-gauge.