"Judging from this puppet alone, the concept was novel, the design ingenious, the functions diverse, and the tactical setup quite good. The only thing lacking, I think, was—materials!"
"Materials?"
Sasori fell into thought.
"Look, traditional puppets were mostly made of wood, paired with iron weapons and mechanisms. But no matter how hard the wood was, its strength was limited. Take yours, for example."
Keiko pointed at the "Asura Woman" on the ground.
"What if these weapons and this tail were replaced with Damascus Steel, a specialty of Sunagakure? Wouldn't the results be much better?"
Sasori quietly pondered Keiko's words.
"Also, I think these wooden structural components could be replaced as well..."
"But if everything were made of iron, it would not only limit the puppet's malleability and flexibility during construction, but also greatly increase its weight. The puppet would become slow and difficult to control, and some fine tactical movements would lose precision. It would also rust easily over time..."
Sasori shook his head.
"Did I say to use iron?"
Keiko raised an eyebrow.
"Huh? Then what should we use?"
Sasori asked in confusion.
"My suggestion is—alloy materials!"
"Alloy materials?"
Even Chiyo, standing nearby, became interested.
"That's right. Of course, I'm no expert in this field. There should be people at the technical school who specialized in it; they had a dedicated casting program there. Let me give you an example. You know bronze, right?"
"Mhm."
Sasori and Chiyo both nodded. It seemed that both grandmother and grandson were taking this seriously.
"Bronze is a copper-tin alloy. Not only is it harder and tougher than copper, but it is also lighter. If we could develop an alloy that weighed the same as wood—or even less—while having greater strength and toughness than hardwood, then wouldn't that mean...!"
"Yes!" Chiyo excitedly gripped