When shipping clay blocks by air, weight is an important consideration due to shipping costs and regulations. Clay blocks, depending on their size and composition, can vary in weight. Generally, synthetic clay blocks are lightweight compared to traditional clay bars made from natural clay.

Specifically, synthetic clay blocks are designed to be lighter and more ergonomic, making them easier to handle and ship compared to heavier alternatives. This lightweight characteristic can contribute to lower shipping costs and easier handling during the shipping process, whether by air or other means.

For precise information on the weight and shipping considerations of clay blocks from specific brands like Marflo or others, it's best to refer to the product specifications provided by the manufacturer or supplier. They can provide detailed information tailored to their specific product lines and shipping practices.