Rashi on Exodus 28:33/רש"י על שמות כ״ח:ל״ג

1רמוני POMEGRANATES — They were round and hollow, similar to that kind of pomegranates which are made like (have the form of) a hen’s egg.

2ופעמני זהב AND BELLS OF GOLD — bells, together with the clappers in them.

3בתוכם סביב IN THE MIDST OF THEM ROUND ABOUT — i. e. between them (the pomegranates) all the way round the hem: between every two pomegranates there was one bell attached hanging from the hem of the Robe (cf. Zevachim 88b).