请问这把伞骨是什么材料制成的？
由于伞骨前端带钩，普通手术难以顺利取出。[{'character': '由', 'pinyin': 'iou2', 'highest pitch': 10.09, 'lowest pitch': 8.6, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '于', 'pinyin': 'v2', 'highest pitch': 10.13, 'lowest pitch': 9.13, 'duration': 0.17, 'prosody hierarchy': '#2'}, {'character': '伞', 'pinyin': 'san2', 'highest pitch': 10.51, 'lowest pitch': 8.56, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '骨', 'pinyin': 'gu3', 'highest pitch': 10.21, 'lowest pitch': 6.72, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '前', 'pinyin': 'qian2', 'highest pitch': 7.81, 'lowest pitch': 6.15, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '端', 'pinyin': 'duan1', 'highest pitch': 10.27, 'lowest pitch': 7.81, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '带', 'pinyin': 'dai4', 'highest pitch': 10.67, 'lowest pitch': 6.69, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '钩', 'pinyin': 'gou1', 'highest pitch': 9.74, 'lowest pitch': 6.74, 'duration': 0.25, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.13}, {'character': '普', 'pinyin': 'pu3', 'highest pitch': 6.89, 'lowest pitch': 6.43, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '通', 'pinyin': 'tong1', 'highest pitch': 11.33, 'lowest pitch': 6.43, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '手', 'pinyin': 'shou3', 'highest pitch': 11.33, 'lowest pitch': 5.65, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '术', 'pinyin': 'shu4', 'highest pitch': 8.28, 'lowest pitch': 6.0, 'duration': 0.22, 'prosody hierarchy': '#2'}, {'character': '难', 'pinyin': 'nan2', 'highest pitch': 7.45, 'lowest pitch': 6.25, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '以', 'pinyin': 'i3', 'highest pitch': 8.09, 'lowest pitch': 5.79, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '顺', 'pinyin': 'shuen4', 'highest pitch': 9.53, 'lowest pitch': 6.41, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '利', 'pinyin': 'li4', 'highest pitch': 8.27, 'lowest pitch': 6.67, 'duration': 0.13, 'prosody hierarchy': '#1'}, {'character': '取', 'pinyin': 'qv3', 'highest pitch': 6.19, 'lowest pitch': 4.45, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '出', 'pinyin': 'chu1', 'highest pitch': 8.54, 'lowest pitch': 4.45, 'duration': 0.32, 'prosody hierarchy': '#4'}]