A golf club head in accordance with various aspects of the present invention, may have a higher volume andor higher strength. Plenoptic camera technology, in particular focused plenoptic camera technology including but not limited to super-resolution techniques, and other technologies such as microsphere technology may be leveraged to provide thin form factor, megapixel resolution cameras suitable for use in mobile devices and other applications. The inner diameter section of each retainer piece is matable to the groove diameter such that the retainer piece protrudes from the groove. The intermediate tube has a lumen through which the innermost tube extends. A user is allowed to interact with the interactive display extension device to request additional information to be displayed. By performing heat treatment on a giant magnetostrictive material within the temperature range of 750 to 860\xb0 C.