Biodegradable polymer which, edible films have gained more attention due to their environmentally-friendly characteristics, vast variety and availability, non-toxicity, and low cost. Biodegradable polymers have a long history, and since many are natural products, the precise timeline of their discovery and use cannot be accurately traced. One of the first medicinal uses of a biodegradable polymer was the catgut suture, which dates back to at least 100 AD. The first catgut sutures were made from the intestines of sheep, but modern catgut sutures are made from purified collagen extracted from the small intestines of cattle, sheep, or goats. The concept of synthetic
Pena (musical instrument) is also tied to the instrument tail. The bow is wooden and bears a curved flourish at one end which is made of metal. In some parts, the bow also features tiny metal bells. The string is traditionally made of horse hair but, sometimes, metal strings and strings made out of wood fiber are also used. Pena (musical instrument) ꯄꯦꯅꯥ(Pena) , also known as "Tingtelia" in Tangkhul Language is a mono string instrument falling in the lute category, similar to some of the traditional Indian stringed musical instruments such as Ravanahatha, "Ubo" or the "Kenda", found in various parts of