It's a Belbal 14" Mass sit to Pop! I inflated these balloons until they are almost going to burst so that when I sit on them, it only takes my weight to pop them. Sometimes, they pop when I barely touch them, sometimes they don't... And that's what I find overinflated sit to pops thrilling because you NEVER KNOW! Which ones are stubborn and tough to break? Which ones are weak and easily popped?