what is its technical specifics?
There are aftermarket modifications to enhance the system with up to 16GB of DDR3-1600 RAM, 7200-rpm hard drives or third-party SSDs
MacBook Pro
Since the RAM and the hard drive on some generations of MacBook Pro are user-serviceable parts, there are aftermarket modifications to enhance the system with up to 16GB of DDR3-1600 RAM (although maximum capacity and frequency depend on the hardware in question), 7200-rpm hard drives or third-party SSDs. 
what are the different sizes of macbook pro 15 and 17-inch which metal is used to build the first generation? UNANSWERABLE who or what is responsible for its fabrication? UNANSWERABLE
wiki:9257324
MacBook Pro [SEP] Technical specifications
Since the RAM and the hard drive on some generations of MacBook Pro are user-serviceable parts, there are aftermarket modifications to enhance the system with up to 16GB of DDR3-1600 RAM (although maximum capacity and frequency depend on the hardware in question), 7200-rpm hard drives or third-party SSDs. A third-party caddy was also made, allowing the internal optical drive to be replaced with a second internal SATA 2.5" hard drive.