Here are the old and new hera that I have in the shop at the moment. I think I actually sell more for creasing paper than for using on fabric.
The rest of the photos are hera in my collection. Most of them have turned up in old sewing boxes that we buy to sell in the shop. An exception is this first one which has my surname 'Ochi' written in katakana and belonged to my mother-in-law Sonoko.
Most of my hera are made from bone and there is some variation in size and shape.
These are the smallest ones. The shortest is 8cm long:
And finally a couple of plastic ones: