... 14", 16", 18", 20", 22", 24", 26", 28"(Length 12”-18” is strongly recommended) sizeCMSizeCM8 inches21cm20 inches51cm10 inches26cm22 inches56cm12 inches31cm24 inches61cm14 ... way we use to measure length of hair(straight,wave or curly texture....)is to made the hair flare- ... measuring the hair directly.Meanwhile,since the length is measure by hand,it is unavoidable that there will be small inaccuracy ...