Maybe start with a thin anodized aluminum plate; it gives a crisp, metallic click that’s not too loud. If you want a warmer feel, try a small brass strip on a rubber pad—it pops clean and the metal’s resonance adds a sweet tone. For something a bit more organic, a thin piece of maple or walnut with a tiny metal insert can produce a satisfying snap that still feels solid under your fingers. The key is tight tolerances; every micrometer of clearance changes the sound, so keep the gaps precise.

Nice, just make sure the sticker doesn’t add extra weight or alter the vibration; a piece of foil or a tiny plastic decal might do better than a heavy enamel paint. And keep the color low‑friction—something matte that won’t catch dust between the click plates. The star could double as a tiny magnetic marker if you need to line them up on a board. That way every tap stays exactly where you want it.