Product Description:
[Size] appr. 20x20mm( L x D) / pc; Weight: appr. 5-7 g / pc; Sold by weight. Uneven size.
[Material] Ceramic
[Usage] It can be used for all biological internal filters, external filters, drop purification filtration systems and garden pond filters.
[Feature] Purify the water quality to keep fish and plants healthy; reduce the frequency of water changes; and have a long service life.