The magazine body and follower are constructed of a proprietary DuPontA(R) Zytel(TM) based polymer to ensure a long service life. The springs are precision wound using heat-treated chrome silicon wire. The result is quality, consistency, durability and reliability. The SAI 02 is a 10-rd box-magazine designed for the Saiga* 12-gauge shotgun. The spring is made from heat treated Chrome-silicon wire for maximum reliability and smooth feeding.