English: Soviet AK "bakelite" magazines. These rust-colored steel-reinforced 7.62×39mm magazines weigh .24 kg (0.53 lb) empty and are often mistakenly identified as being made of Bakelite (a phenolic resin), but were actually fabricated from two-parts of AG-S4 molding compound (a glass-reinforced phenol-formaldehyde binder impregnated composite), assembled using an epoxy resin adhesive. Noted for their durability, these magazines did however compromise the rifle's camouflage and lacked the small horizontal reinforcing ribs running down both sides of the magazine body near the front that were added on all later plastic 7.62×39mm AK magazine generations fabricated from ABS plastic. Three magazines have an "arrow in triangle" Izhmash arsenal mark on the bottom right. The other magazine has a "star" Tula arsenal mark on the bottom right.