The item for sale is 4 Ounces (by weight) of Potassium Hydroxide (KOH); also known as Caustic Potash. Potassium Hydroxide has many of the same uses as its chemically similar neighbor "Sodium Hydroxide" (i.e. Caustic Soda). CAUTION: Contains Potassium Hydroxide (Caustic Potash). Avoid contact with skin, eyes, mucous membranes and clothing. First Aid: External: Flood with water. Internal: Drink Large quantities of water. Call emergency room or physician immediately. Eyes: Flush with water for 15 minutes. Get prompt medical attention. Store in a cool dry place. Keep out of reach of children. STURDY PLASTIC BOTTLE: Our bottles are made of durable Nalgene HDPE, which is a translucent, lightweight, durable, and chemically resistant thermoplastic. The screw-top is completely leakproof and childproof. The bottles' flat top makes them stackable and their wide mouth allows them to pour easily. The square, "space-saver" shape makes them a perfect addition to any shelf or travel kit. Every bottle we ship is sealed in plastic with the screw-top shrink-wrapped. HUNDREDS OF USES INCLUDING: Bio-Diesel Production / HHO Generator Electrolyte / Chemical Reagent / pH Increaser / Tanning (Hair Remover) / Battery Electrolyte / Potassium Soap / CO2 Absorbant / Desiccant. SHIPS FAST FROM CALIFORNIA, USA: Your item will be in the mail the same day you place your order. We ship three times a day, every day of the week. From California, transit time throughout the United States is 2-4 days.