Quantity: 1 piece, otherwise you could lose it. Use a milk straw or an air pump. Inflatable: Find the appropriate filling tap. Insert the air pump or straw into the filling tap. Pump up to 90% saturation. Inflate slowly and feel the air pressure, then stop. When removing the straw, press both sides of the filling tap and then slowly remove the straw. Avoid wrinkles that cause air leaks. Keep the filling valve for 5 seconds. Then it will seal automatically. Important information: Helium is not recommended for 86.4 cm sheets. Maybe a failure. Because the material is sometimes thicker and heavier. Blue numbers are, for example, thicker than gold numbers. 86.4 cm corresponds to the size indicated before inflation and approximately 66 cm after inflation. If you need 34 inches after inflation, please order a size of 100 cm. They are larger and can float with helium. After inflation, it only takes 10 minutes, hours or days. The straw was too thickly pulled, the sealing strip of the tap was bent and this joint was damaged. If you feel the air pressure, stop immediately. Note that there are fewer folds on the surface of the numbers. This means that the air pressure is higher. It can explode at any time. Maybe immediately or a few minutes later or a day later. The sheet has no elasticity.