Translated: Hanging speed bag (pear-shaped) from the company Booster. Bags of this type are placed either on the ceiling or on the wall and are designed to help the user improve their speed and synchronization. They are usually inflated and are not suitable for kick training. The bag is delivered empty, so you can fill it with the material of your choice. Usually, bags are filled with the following materials: sand, water, air, and fabric. Each material has different properties and uses. Air is usually used in speed bags (pear-shaped bags), with the disadvantage that the bag will need refilling depending on how often you use it.