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Source Secrets of Magic pg. 170 1.1
Spellhearts are made from the same basic materials as talismans, though their complex construction—magically iterated around the concept of a single kind of spell—gives them a variety of additional powers and means they persist rather than burning out when used.

Unlike talismans, a spellheart can be used repeatedly, and doesn't burn out after use. Each spellheart can be attached to different items, giving a benefit depending on your choice, which means you can plan ahead in facing expected dangers. They have the spellheart trait.

Click here for the full rules on Spellhearts.