
It is the IKEA PS FÅNGST. A Hanging storage tube thing made of mesh with 6 compartments for $4.99. It was 8.99 many years ago and they had more colors... i guess they are being phased out.
you put a nut in 1 or 2 compartments every night and the squirrel spends a good 20 minutes checking every section for the nut several times a night.
IKEA looks to be running out:
http://www.ikea.com/us/en/catalog/products/70115578/
http://www.ikea.com/us/en/catalog/products/40096166/
http://www.ikea.com/us/en/catalog/products/90096164/
They used to have smaller 4 section ones as well.
others are selling them as well:
http://www.spacesavers.com/Storage/Innovative-Home-Creations/5-Tier-Hanging-Storage-Organizer

and many new and used on ebay