Size for small mallets: Inner 4.7 x 3.1 x 0.8 inches (12 x 8 x 2 cm); Can be attached to many small mallet types, including #3, 330 Mallet, Rossie, and more; Size for entrance width: 5.1 x depth 1.0 inches (13 x 11 x 2.5 cm); Includes 2 balls; Can be used with many mallet type; Size for use with many mallet types; Size for square mallet width: 1 x 3 x 3 cm). Depth: Approx. 4.7 inches (12 cm). Thickness: Approx. 1.0 inch (2.5 cm); Includes 2 balls, can be attached to many mallet type putters, tailor-made large putters, and more. Package Contents: 1 x Cover: 1 x Material: Premium PU leather, acrylic (lining).