Induro BHD3 Ballhead 55lb Load Capacity Only products shipped from and sold by authorized resellers such as Amazon.com can ensure that you will be receiving product that has a valid 10 year US warranty upon registration. Magnesium Alloy  provides a lightweight ballhead with maximum strength Adjustable Manual Drag Control  provides responsive adjustment to compensate for different camera/lens weights Independent 360 Pan Control  makes horizontal panoramic adjustments easy Oversized lock knobs  ergonomic knobs for easy locking and drag control, even with gloves Arca-Swiss compatible system  interchangeable QR system assures smooth and rapid camera/lens changes