This set of ring sizers is great for travel. It's all plastic construction makes it lightweight, and easy to use. It measure in US standard. The mandrel is 12 inches long and the ring sizers set has 29 plastic rings on a single chain to stay in order.

The plastic mandrel is black, with white engraved markings | sizes 1-15

The 29 piece set of ring sizers goes from size 1 to size 15 in half steps

The mandrel is 12 inches long overall, and the set weighs 9 ounces

These two ring sizer features measurement in US standard only

Both are lightweight and easily portable for tradeshows and appraisals on the go