They are also made of 4-inch plasterboard to make them more durable. In addition, 4-inch wood balls are made of different wood and a variety of plastics to make them more durable. Even though, aster plasterboard is possible, it is different in a variety of sizes.
The sizes of 4 inch wood balls differ between their 1 and 2 models depending on the material and their weight. Find out different sizes of 4 inch wood balls on Alibaba.com and be sure to find a wide range of different sizes of 4 inch wood balls on Alibaba.