This Amazing Combo is very popular since Sage is an herb known to cleans and clear yourself and your space (items) of negative energy and entities.  Instructions and prayers come with this item. California sage is known to be one of the best herbs/sages to use when purifying you or your space. Should be used on self first before cleansing others, pets or your spaces to protect you from being jumped by negative forces during your clearing process. Pieces can also be broken off and used as a tea to help cleans from the inside out, also many claim it litterally cleanses the air from impurities and toxins.
Palo Santo is used to place positive energy into a space once cleansed, although it can also be used to clear and purify a space and your person, but Palo Santo can get confused on what its purpose is so when used in conjunction with Sage, it will then fill the cleansed space with light positive energy giving darkness no where to hide or enter.  It can also make a wonderful tea as it has a nice minty smell and flavor.