We just raised the bar for training projectiles with a ball that is impervious to temperature and weather. Our new MAX2 Training Ball is made of wax, the center is powder, which leaves an obvious mark on impact. This powder fill cannot "settle out" over time, and does not resist acceleration the way liquid and paint fills do - it is the ideal fill for promoting training. The biggest advantage to the MAX2 Training Balls, over paintballs or any other training round, is how the wax shell is impervious to weather. Their top-quality construction gives these rounds a three year shelf life...minimum. The shell will not get soft during hot desert drills, nor will it swell on humid summer days...or in the rain. Don't throw away any more spoiled paintballs Powder Balls will be intact, rigid, and straight-flying when you need them most. This resistance to deformation also helps improve accuracy, as it means that each ball retains its uniformity.NOTE: these balls' shells are made of WAX. It cannot handle high-tension spring pressure from HDB or HDX shotgun and will not work on these models - Work with ALL hopper fed paintball marker- Outer Shell is made by water-proof material- Work in ALL weather condition- Better accuracy and no shape deform- Weight 3.2g ± 0.1g- Extremely long shelf-life (at least few years)- All material are made by Non-toxic & No harm to human- Best for shooting with a paintball marker with the velocity of 280fps With the MAX2 Training round, you can train like you're going to fight: in the rain, sleet, snow, or whatever nasty weather challenges you. These rounds are ideal for training in changing, challenging, and downright inhospitable environments. PERFORMANCE FEATURES STANDARDPAINTBALL MAX2 Training Ball Works with all .68 caliber launchers yes yes Impervious to water no yes Works in rain, hail, sleet, or snow no yes 3 years shelve life no yes Perform in extreme COLD condition -30F no yes Perform in extreme HOT condition 120F no yes