Hearts of palm are cholesterol and sugar-free very low in calories fat and carbohydrates and high in fiber. The canned ones are relatively high in sodium so if that's an issue for you don't add salt or use with salty ingredients in recipes. Once opened refrigerate them in their jar covered in the water they come in. They will keep for up to two weeks. Hearts of palm benefit from quick rinsing and drying before using which helps remove some of the jarred flavor. Features Pack 12. Size - 14 oz. TI/HI - 15 x 11. Cube - 0.29. Dimension - 2.88 D x 2.88 W x 4.25 H in.