Premium Quality Silicon Rubber Balls for Training Purposes. These rubber balls are designed to be used at night or in winter because they contain fluorescence which gives a special effect and amazing experience. The balls should stay for a short time under the light (for example under flash light from the smartphone). After that, as soon as you bring them into the dark, their unique green florescent color starts to shine. Wonderful effects on playing paintball or home training. Great shooting experience thanks to the high quality materials used in the production. Even tough they are softer than other rubber balls in our store, these balls have also very strong effects: They can be used for home and self defense too. Article Details: Premium Quality Rubber Silicon Balls in 43 cal. (each weighs 0,85 gr.) Unique Experience: The balls lighten at dark thanks to its blue fluorescence pigment. Suitable for Paintball and Self Defense Guns in 43 caliber. Made in EU Standards - high quality product Special Training and Shooting Experience 100 rubber silicon balls for 43 caliber paintball and RAM weapons. These rubber balls are also ideal for slingshots. They are made of soft rubber and made in EU standards. Due to the very high quality, the rubber balls are super precise and also significantly rounder than comparable balls. One box of Rubber Balls (100 pieces) in 43 cal. weighs ca. 100 gr. (one single piece weighs around 0.85 gr.) Very good shot and hit picture. These rubber silicon balls are designed to be used at night or in winter because they contain fluorescence which gives a special effect at dark. Wonderful effects on playing paintball or home training. Great shooting experience thanks to the high quality materials used in the production.