prov:value
| - It is further preferred that the material is somewhat flexible and there can be used, for example, thermoplastic resin such as polyolefin such as polyethylene, polypropylene, ethylene--propylene copolymer and ethylene--vinyl acetate copolymer, polyvinyl chloride, polyamide elastomer, polyester and polyurethane, silicone rubber, latex rubber, etc., the thermoplastic resin being preferred and polyol
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