These are rubber. They are bands. They hold they snap they can put an eye out so better be careful. Can't see myself without some at home at work in the car on vacation.
This is the perfect size band to create "Bungie Cords" for use with Barbie dolls while investigating linear equations! They are not too long and not too short - but just right! The bands are reliable and maintain their stretch during this activity. The large quantity of bands makes it economical and I get two years use from one large bag. A great product for this use and lots of fun too!