RikudouGoku
Member of the Trade: RikuBuds
that would makes sense if they didnt separate them into 2 products.Just my guess, but red is for right. To easily find out left and right.
Could be just your preference of aesthetics as well though.
https://www.amazon.co.jp/-/en/gp/product/B083TGWHND/ref=ox_sc_act_title_1?smid=A13AUKCYIU1OMA&psc=1
https://www.amazon.co.jp/-/en/gp/product/B083TGF5X5/ref=ox_sc_act_title_2?smid=A13AUKCYIU1OMA&psc=1