We present findings of mass, velocity, and composition of 22 small-mass meteors detected optically in Arecibo, Puerto Rico. Spectral observations of these meteors showed evidence of various metals including Na, Mg, Ca, and Fe. Evidence was also found for differential ablation, the process by which more volatile elements ablate earlier in the meteor's path. These spectral observations of the smallest, faintest meteors greatly improve our understanding of the composition of this meteor population.