Shabbat is the Jewish day of rest. The two requirements on that day are to observe and remember, which are symbolized by lighting two candles at the beginning of the Shabbat (just before sunset on Friday).
The candles are usually lit by the woman of the house and involve a ritual which includes a blessing.
Not being Jewish, I can't give a deeper explanation, but I think that is the gist of it. As Besarien noted, the intent of these small foldable holders would probably be for travel
Junkseller & Besarien have it: they're Sabbath candleholders. Jews light a minimum of two candles to begin the Sabbath each Friday night; parents w/children light an extra candle for each child, at least when at home. I think Besarien is right that these are meant for travel, due to their small size; at home actual candlesticks are more common.