This is a paid asset, but now you can download 3D Balls Collection for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
3D Balls Collection v1.0
Set of 9 low-poly models with one material for each ball:
-Basketball (2048*2048px)
-Dodgeball (2048*2048px)
-Voleyball (2048*2048px)
-Soccer ball (2048*2048px)
-Football (American) (2048*2048px)
-Golf ball (1024*1024px)
-Tennis ball (2048*2048px)
-Baseball (2048*2048px)
-Beach ball (2048*2048px)
Materials contain 3 textures: diffuse (Albedo), normal map, metallic texture (with adjusted smoothness)
All textures are applied and adjusted.
All meshes are fitted to Unity measurement systems and correspond to the dimensions of existing originals.