Center bolt is fully shielded inside the case - no metal on metal contact. Interior foam pad increases cymbal protection by minimizing abrasion and rattling during transport. Integrated roller wheels will stand up to the most punishing surfaces, and the sleek tow handle extends and retracts quickly with ease. Threaded 'Z' knob in front of case allows for smooth and swift opening and closure. Travel by air, land, and sea to your gigs worry-free!