YS Design is offering two new iPod shuffle cases made form machined aluminum. The Japan-based company has recently released the HardCase Simple and the HardCase G5, which resembles the design of Apple’s Power Mac G5. While there are no apparent plans to offer them in the US or other countries, the $60 cases will begin shipping April. They can be used with a wrist strap, require a female USB cord or adapter, and weigh about 30g. The HardCase Simple can be engraved on the front or back with up to 10 characters for an extra $5. A basic image can be engraved for about $20 more.