littleBits o29ラウンドLEDマトリックス用シリコンカバー

The silicone has a nice soft matte feel and diffuses the LEDs just enough that they aren't harsh up close. It hugs the matrix tightly so there's no gap or wiggle, and clipping it to the hand mount is effortless.

Snaps right onto the hand mount and stays put even when I'm waving my arm around, which I honestly didn't expect from silicone this thin. The diffuser effect is a nice bonus — the LEDs look softer and less harsh now.