In the early 1800s hollow brass, nickel & copper beads were traded to American Indians by French Traders. These were historically used on breastplates, necklaces, chokers, bandoliers/bandileers & miscellaneous other items of adornment. These are fairly smooth round beads. These have not been made in over 75 years & are available now for use on current items. 
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Price is for the quantity & size you select from the pull-down menu. Photo(s) is(are) enlarged to show detail.
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There are plenty of free on-line measurement.