i buy white ones like that and either tortoise or black ones as well. then i carry both colors in my pocket. then i can choose whichever one is furtherest from the color of the floor of the stage. that way you can see them when you drop them even on the darkest of stages. i usually use white because it generally stands out on dark gray stages, even tortoise ones disappears under stage lights on a gray carpet.
i bought a whole gross of those little white ones (which i love) except they were NOS 70's music man picks w/ logo of the little men wearing bell bottoms on
johnny atomic