Only Japan gets colored Wiimote straps in September

Nintendo isn’t ready to release a Wii remote rainbow yet. If you want to distinguish your remote in a Wii Sports party you can do it with a different color Nintendo branded wrist strap. Four colors will be released this September in Japan: blue, green, pink, and white. You get all four in the set pictured above for 1,000 yen ($9.25), but you can purchase an individual strap for 300 yen ($2.75). Different colors, I see that it. Why white then? Is it supposed to be a replacement strap? If so then why is it bundled with the four pack of wrist straps?

Images courtesy of Nintendo.