Look at the olive strings or long strings, strings try to avoid choosing barrel round or round spacer beads, you can choose to use a flat piece of amber, ivory, coconut shells, turquoise, the market can choose from a variety of things, the price is not very expensive, the long strings depend entirely on personal preferences, personal feeling, if you play with the olive color out of the red with yellow, white, crystal or chalcedony color is still shallow when it is recommended to choose a similar color to do spacer beads!