Petra
The texture is hard and smooth and what one would think metal would feel like but what was odd is that it wasn't super cold and it had a slight warmness to it. Alphonse would chuckle allowing her to examine it. He couldn't feel her touch through it though it was one of the things he still hasn't gotten used to having to be very gentle when using it. "Yeah it's amazing worked real hard on it" Al says as he looks at her in the eyes, his expression soft.
Scott
Her eyes widen but her hands are kept on the artificial arm. "You made this arm yourself? Impressive! You are very smart. I cannot imagine being able to create my own arm! The only thing I have made are just some dress designs. They are rather plain, too. But, they are dresses nonetheless." She puts a hand to her mouth, unintentionally hiding her smile. "Has the arm served you any convenience? Of course, since you have built it yourself, there must be more than it than an arm, correct?" Amelia probably pegs Alphonse as a mad scientist. She's completely mistaken him for one, but it's a funny thought.
Petra
"I mean I did get some help some one else was able to attach my nerves to the proxy, but the design and programming are mine though" Al says rubbing the back of his neck with his regular arm. "Well the arm has a few *Ahem* Abilities that I progrmmed into it, but that's a suprise, it can lift things that are heavier than what I can usually lift and has a stronger grip, but other than that nothing out of the usual." He answers. "Though tweaking it was a bit of a challegen when playing instruments" Al chuckles.
Scott
"It sounds like a very convenient arm! There are times when I wish I could have been stronger and lift things when need be." She waves her hands in front of her frantically. "A-although, I am not saying that I want to lose my own arm just to have a mechanical one!" The tone of the conversation seem to revert back to sentiment. "May I ask... What happened to your arm?" Amelia understands it could be a touchy subject, but at the same time, she'd like to get to know Alphonse more. That is, if he's comfortable with it.