这个东西是什么材质的？
周边包裹着类似海绵颜色的物体，用指甲轻轻一抠就能抠掉。[{'character': '周', 'pinyin': 'zhou1', 'highest pitch': 9.92, 'lowest pitch': 9.76, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '边', 'pinyin': 'bian1', 'highest pitch': 9.69, 'lowest pitch': 9.17, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '包', 'pinyin': 'bao1', 'highest pitch': 10.39, 'lowest pitch': 9.17, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '裹', 'pinyin': 'guo3', 'highest pitch': 8.81, 'lowest pitch': 5.78, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '着', 'pinyin': 'zhe5', 'highest pitch': 7.82, 'lowest pitch': 6.4, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.07}, {'character': '类', 'pinyin': 'lei4', 'highest pitch': 9.31, 'lowest pitch': 7.95, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '似', 'pinyin': 'sii4', 'highest pitch': 8.45, 'lowest pitch': 7.78, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'character': '海', 'pinyin': 'hai3', 'highest pitch': 8.29, 'lowest pitch': 5.82, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '绵', 'pinyin': 'mian2', 'highest pitch': 10.51, 'lowest pitch': 5.82, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '颜', 'pinyin': 'ian2', 'highest pitch': 10.33, 'lowest pitch': 6.96, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '色', 'pinyin': 'se4', 'highest pitch': 9.14, 'lowest pitch': 7.68, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.11, 'lowest pitch': 7.1, 'duration': 0.12, 'prosody hierarchy': '#1'}, {'character': '物', 'pinyin': 'u4', 'highest pitch': 9.07, 'lowest pitch': 7.58, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '体', 'pinyin': 'ti3', 'highest pitch': 6.47, 'lowest pitch': 4.93, 'duration': 0.34, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.42}, {'character': '用', 'pinyin': 'iong4', 'highest pitch': 9.33, 'lowest pitch': 7.89, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '指', 'pinyin': 'zhiii3', 'highest pitch': 9.91, 'lowest pitch': 7.89, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '甲', 'pinyin': 'jia5', 'highest pitch': 9.33, 'lowest pitch': 7.44, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '轻', 'pinyin': 'qing1', 'highest pitch': 10.25, 'lowest pitch': 9.55, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '轻', 'pinyin': 'qing1', 'highest pitch': 10.25, 'lowest pitch': 9.55, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '一', 'pinyin': 'i4', 'highest pitch': 9.99, 'lowest pitch': 8.44, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '抠', 'pinyin': 'kou1', 'highest pitch': 10.61, 'lowest pitch': 10.01, 'duration': 0.31, 'prosody hierarchy': '#2'}, {'character': '就', 'pinyin': 'jiou4', 'highest pitch': 10.48, 'lowest pitch': 7.45, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '能', 'pinyin': 'neng2', 'highest pitch': 7.45, 'lowest pitch': 5.9, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '抠', 'pinyin': 'kou1', 'highest pitch': 10.61, 'lowest pitch': 6.71, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '掉', 'pinyin': 'diao4', 'highest pitch': 8.98, 'lowest pitch': 5.78, 'duration': 0.33, 'prosody hierarchy': '#4'}]