Universal material of Sugru type, it is soft like plasticine in consistency, but after drying it turns into a super strong rubber. This material, as well as products made of it, does not lose its qualities even at temperatures from -60°C to +180°C.  You mix two parts of the bag together, roll into a ball, then wait 30 minutes, after which you can form the desired shape. After 24 hours, the lump solidifies permanently. In the shape you give it. There are 5 different colored bags in the set.