Chainologie Colored Brass Chain _#16: Warm Coral 2.75x2mm Filed Curb Chain (per 6 feet) Colorful brass chain enameled in Warm Coral Lead-free, nickel-free, cadmium-free Brass Chain Links measure approximately 2.75mm long x 2mm wide x 1mm thick outside dimensions Top and bottom of each link has two filed sections that are flat instead of rounded. (Filed sections show brass; the enamel has been filed away along with part of the chain to produce the pattern.) Links accommodate a 24-gauge headpin, but are too tight for the 22-ish gauge headpin