Sirui C-10S Ball Head with Quick Release Plate, Supports 28.7 (13kg) Sirui C-10S Ball Head - Quick Release Plate - Soft Case - Sirui 6 Year Limited Warranty Separate control knobs for panning and locking, for fast easy operation. SIRUI's unique locking mechanism provides superior locking performance and load capacity. Red Safety Release button that lets you slide off the QR plate without completely opening the Quick Release Clamp. Compact design for Series 0 and Series 1 tripods.