Heartsdales was a Japanese-American hip pop duo composed of sisters Yumi Sugiyama and Emi Sugiyama, known by their stage names Rum and Jewels, respectively. Yumi was born on December 17, 1981 and Emi on December 4, 1976 in Tokyo, Japan.

Heartsdales是一支日本hip hop组合，由姐姐Emi Sugiyama 杉山エミ和妹妹Yumi Sugiyama 杉山ユミ组成，成军后两人的艺名为Jewels和Rum。

大型タイアップ2曲を収めた両A面シングル。倖田來未&Heartsdalesを迎えたPS2『クリムゾンティアーズ』の主題歌「SWITCH」と、TDKの企業CMソングをカップリング。