Why do some rosaries have a skull and crossbones?

Could someone please tell me why there are skull and crossbones on the bottoms of some rosaries?

thank you

The following link should explain the symbolism of the skull and crossbones on your crucifix. If you have any further questions please contact Catholic Answers directly.

Recommended Reading:

Why is there a skull-and-crossbones on the papal casket?

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.