Must-see for those aiming to improve their baseball performance! Training with sandballs is very effective for strengthening hitting power, core muscles, and improving form. Because they are heavier than regular balls, they put a good load on the muscles, and you can expect to increase your distance and swing speed. This is a deluxe set that combines balls from multiple manufacturers and multiple weights. You can change the load depending on the purpose, so it can be used for a variety of training. An air pump is also included, so you can start practicing right away. Please take this opportunity to incorporate it into your daily training! [Set Contents and Condition] Details are as follows. Please check the condition of the product carefully before purchasing. 500g (Cyfie): 6 total New, unused: 4 Used: 2 (some scratches and dirt due to use) 450g (INDIVE): 5 total New, unused: 4 (Sorry, I forgot to include one unused one in the photo.) Used: 1 (cracked. Sand will eventually scatter during use) Air pump: 1 (operation confirmed) *Please understand that the new items have been stored at home. *Used items will be cleaned before shipping. [About Shipping] Due to the weight, we will pack it securely and ship it via Yu-Yu Mercari (anonymous delivery) Takkyubin. [Other] Instant purchase OK. How about it for players and coaches who are aiming to power up?