The amount of formalin in the specimen jars is approximately half the volume of the jar. Impact-Resistant. 10% Neutral, Phosphate Buffered Formalin. Wide-mouth. Ribbed, leakproof and easy to open cap. Material: Polypropylene. Additional Information: Composition / Ingredient: Polypropylene; 10% Neutral Phosphate Buffered Formalin Colour: Clear Volume: 30mL Feature / Property: Prefilled, Impact-Resistant, Wide Mouth, Ribbed Leakproof And Easy To Open Cap