a small key in a strip of silk

The small, crooked key hanging from a strip of silk seems light and easy to keep hidden when necessary. The silken thread is somewhat dirty and grey in colour, more reminiscent of a spider's webbing than a high quality cloth.

It is a small key in a strip of silk.
It weighs half a pound.

You identify a small key in a strip of silk.
It is an unsellable key.
It weighs seven ounces, and it is worth about one silver.
Its keywords are key, small, strip, and silk.