Blink Bearings

This small bag contains a number of fragile glass beads, each bead magically paired to one of the same color. As a free action, someone wearing the bag may draw up to two beads of a chosen color. If both are broken within 1 min, the last two creatures or objects of large size or smaller magically switch places. Unwilling creatures must make a DC 13 Constitution saving throw or be magically swapped.
If a target is too large to switch, the other object or creature appears adjacent to it.