Giotto's ball head series feature a light and extra large hollow ball. The slim and light body structure of the ball is hardened for strength. Giottos offers a complete range of over 20 different ball heads. With ball heads ranging from ultra small and compact to large, full featured ball heads capable of supporting almost 30 pounds! Giottos offers three different series of ball heads. Their larger heads are available with a quick release system or with standard camera screw screw top plates. One series features quick release camera mounts with an Arca compatible sliding plate. All of these plates features a safety lock with an "auto lock" retaining system and pop-up tabs to prevent accidental camera rotation when shooting vertically. All of the plates in this series are reversible.