Are you looking for some co2 bottle caps? Are you in search of sturdy, trustworthy tools that can do multiple jobs at once? , ! Our professional co2 bottle caps must meet you needs. It is one of the for you. For people who love DIY CO2 setup, this bottle lid is a helper when they are doing the process of generating CO2. Features -Color:Light Brown -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -Note:There is difference. -ABS material makes this bottle uneasy to rust and safe for your fish and water plant. -Can be directly screwed onto carbonated beverage bottles, safe, durable and airtight. -If the water plant in your fish tank, aquarium is growing slowly and needs more CO2, this bottle may help you. -Suitable for all kinds of DIY reactors to meet your needs. Professional and durable. -Small size, light weight, it is easy to carry and store, will not take up of space. Package list: 12 x Bottle Caps