need something to pin my floor mat over the tatami and this is so easy to use... you just have to make sure you pin it over the edges of the tatami in order to be set. it's colorless so it quite stand out over my oak colored mat but i guess i can buy some nail polish and paint it to camouflage with the color of my mat... i'm so satisfied because you can attach and remove it so easy without damaging the tatami... ☺