This tool is great for scraping the inside of bottles and jars with narrow necks, with a flexible head that folds to fit inside, and a rounded edge to help you scrape out every bit of food.
2-1/4 x 7/8" flexible head
Fits in bottles with 7/8" and wider necks
Rubber head with plastic handle
A popular Dutch tool, it is known as flessenlikker (bottle licker or jar licker) and flessenschraper (bottle scraper).