Can be melted down with hot water / a heat gun/ iron. Used in fursuit making to attach plastic to other plastic, I use them for attaching hinges and straps to 3d printed bases and for reinforcing the lip area for flexible 3d printed bases that require a moving jaw. Don't melt the bag they're in, and take precautions not to burn yourself.One of these bags is included with any non hinged head base from me

50g white thermoplastic pellets