These new paintballs use the same high-quality AG1 Paintball formula that makes our .43 caliber paint work so well in all markers under all conditions of use. The AG1 formula strengthens the shell and helps prevent chamber breaks. This also helps standardize their size, improving accuracy, functionality, and reliability. .43 Caliber. The best quality paintball - Made in USA Compatibility: - .43 Caliber Markers (Such as below) - RAP17 - RAP4 - RAP5 - RAP226 - RAP47 - T16