Both models come with our signature X-Springs, however, the 16 Sport HD Performance Trampoline with net package ships with an additional set of Performance springs. Made from Piano Wire, the Performance springs deliver our highest, and smoothest, bounce yet. The even rebound is great for families while gymnasts and trickers love our bounce height. With the two sets of springs, you can customize your jumping experience based on your desired bounce – even as it changes over time! Additionally, the Performance Package includes branded pole sleeves, string bag and stickers.