And crystal clear bottles of silver, of which they will determine the measure themselves.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : ((bright as) glass but (made) of silver, which they (themselves) have measured) in the hands of slave youths (to the measure (of their deeds)) it is also said that the drink is so measured that it is neither more nor less than what is required.
Jalāl al-Dīn al-Maḥallī
تفسير : crystal of silver, that is, they are made of silver which is transparent like crystal — which they, that is, the ones passing around them [in service], have measured in a precise measure, according to the measure required by the one drinking it, neither more nor less, which makes for a most delightful drink.