Universal compatibility with all tablets including Microsoft Surface Tablet, Apple iPad, Fire Tablet, Samsung Galaxy Tab, Lenovo Tab, any readers, and cases. Contoured stems (stone tumbled for a smooth finish) slide between your fingers, providing maximum control with minimal effort and optimal comfort. Adjustable VELCRO® Brand base enables the G-Hold unit to be moved for access to kickstand or for optimum comfort positioning. The VELCRO® Brand attachment is thin yet highly durable. It has been tested to hold up to 1.8 kgs (4lbs). Ergonomically designed, patented and scientifically proven to relieve strain on the hand and wrist. Slides flat for easy storage. Rotates 360 degrees for comfortable viewing in portrait or landscape mode. Made with care in Scotland with ergonomic and quality assurances. 4.37' in diameter (111 mm) Color: Black