D Z Strad Central Lock Carbon Fiber Cello Case-4/4 FUll Size Central-Lock System: The unique Central-Lock-System controls 5 individual locks around the case and is operated by a single one handle with a safety device. Light weight: Only 3.3 kg (7-8 lbs). Strong: The case is made of aerospace-grade carbon fiber with cutting edge design to provide better protection than conventional materials. Bow holder: 2 cello bows can be carried inside the case. Color: Dark grey (original color of carbon fiber).