This is a Green Stuff World Plastic Square Base - 50x75mm (8pcs)

Set of rectangular plastic bases with beveled profiles, they are compatible with Warhammer Fantasy, Warhammer the Old World, as well as any other type of wargames or miniatures role-playing games that use miniature bases.

The back of these cavalry bases have 2 holes to insert 5x2mm neodymium magnets. They can also be magnetized with magnetic sheets.