Super Elastic Bubble Plastic was the brand name for a children's toy manufactured from the 1970s through the 80s by Wham-O.
It consisted of a tube of viscous plastic substance and a thin straw used to blow semi-solid bubbles.
The bubble could then be removed from the straw by pinching the hole closed, sealing the air inside.
[1] Besides the potential for spills when liquid plastic was handled by children, the substance also emitted noxious fumes.
[3] This type of toy is banned in Canada and Super Elastic Bubble Plastic was the subject of a Canadian recall in 2016.