In making these bracelets I used "Gematria", a Kabbalistic numbers game, often used to explain, and/or make connections between words, phrases and/or entire passages of the Torah, Talmud, etc.

Every letter of the Hebrew alphabet has a numerical value.  Because the letters have a numnerical value, so do words. The Hebrew word for life "Chai" has the numerical value of 18.

In each bracelet there are 9 rivets.  2 x 9 = 18 rivet heads

Two parents, two bracelets, 18 rivets total

The bracelets are "lively", because the balls in them are never motionless when worn. The balls can spin around in the channels of the bracelets.