חַיִּים טוֹבִים (Chayim tovim)
* חַיִּים (Chayim): Life (plural)
* טוֹבִים (Tovim): Good (masculine plural - used with Chayim)
While you could use the singular "חַי (Chai)" for "life," "חַיִים" is generally preferred as it's the more common way to refer to life in this context. Using the plural "good" agrees grammatically with the plural "life."