To recycle a used core and burn it after crushing it and reducing its volume even if it is abandoned by using composition which comprises paper and heat plastic synthetic resin and a small amount of wax and in which weight of paper is larger than a half of total weight.

A cylindrical member 1 is formed from core composition of paper and heat plastic synthetic resin and a small amount of wax. As the paper, there are used paper of news paper, magazines, a telephone directory and the like. As the heat plastic synthetic resin, there are polypropylene, polyethylene and the like. Weight of the paper is made larger than a half of total weight of the core composition and for example, it is preferable to make the weight of paper more than 100wt. and less than 300wt. Plasticizer, stabilizer, coloring agent and the like may be mixed in the composition. A plurality of thin part 2 are formed parallel with axis of the cylindrical member in an outer wall of the cylindrical member 1.