Ladder chain used on player piano to connect roll motor and transmission. About 5 links per inch (more accurate is 65 links per foot), the lesser common of two sizes usually found in foot pumped player pianos. (there is another size, 4 links per inch which is much more common). Sold by the foot, orders of more than 1 foot will be shipped as one continuous length. The chain is a non-ferrous metal, probably stainless steel.

I've restored player pianos since 1985.  If you have questions about this product before or after your purchase let me know, I'm glad to help.  I include my contact information with each package and you can also reach me through eBay.