Made from premium, , suitable both in salt and for water. Absolutely safe for fish, they won'for t die, or cause any algae problems. Specification: 1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Size: about 10cmx8cm/3.94''x3.15'' 3 colors for , Red,