The main raw materials used today are pigskins, cattle bones and cattle hide . Of these, the most common source is pigskins.
目前，猪皮、小牛骨和小牛皮是主要使用的原料，其中猪皮是最常见的来源。
The main raw materials used today are pigskins, cattle bones and cattle hide . Of these, the most common source is pigskins.
目前，猪皮、小牛骨和小牛皮是主要使用的原料，其中猪皮是最常见的来源。
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