These inflate well with air or helium and if knotted well can last two days (or more). Works with both hand pump and electric inflator. Nice assortment of sizes. The metallic ones do oxidize after about a day, but the color still coordinates well. Comes with knotter, arch strip, glue dots and ribbon. TIPS: If you knot the balloons tightly first, and then tie a piece of ribbon tightly just above that knot, you'll extend the inflation time of the balloon. If you want a nice round shape, don't fully inflate; stop when it's round. rub the confetti balloons with a wool sock to get the confetti to stick to the sides. This is a nice little kit! Would get again!These balloons are so pretty! I love them. The only thing I don’t like is how hard some of them are to blow up. They also don’t taste good when put in your mouth. Be careful of the powder. I do love the colors though!These balloons were great for my son's birthday party! I have no complaints!Sooo many balloons! Worked out great for my party. The balloons are of great quality.I loved the giant ones that came with itCan’t wait to use them this FridayThe balloons were just as pictured! Very durable and easy to tie. This is a great buy!