Mostly jaspers, but also other stones and rarely other materials like glass and ceramic. LOTS of colors, shapes, sizes. Order multiple strands and we'll send you a variety. Yes, some will be dyed. It's as American as chop suey, chop sticks and chopped liver. 14 - 16 inch strands temporarily strung (claspless). In truth, it's the price that's as fabulous as the beads Combine all single bead strands on beading.com to get the pricebreaks.