Manufacturing Defect In Product Liability

Teresa bought a new flat screen TV and installed it on her wall according to its instruction manual. Two days later it fell off the wall and broke. The handyman who came to help her clean up the mess said that the screws she used weren't strong enough to hold the TV bracket. Teresa is upset because these were the screws that came with the TV. She called the company to complain and they apologized. They said that some of the boxes were accidentally packed with screws meant for a much smaller model TV. This is an example of _____.