The Valken SMG 110rd Mid-Cap airsoft magazine is constructed of durable hard polymer material, are lightweight, and can take a beating. This 6mm AEG magazine features a long 45 SMG design and fits the Valken ASL+ Kilo45 AEG or ASL+ Sierra AEG, and holds 110 BBs. They include a strong feed spring to feed flawlessly, and no winding is required like hi-cap magazines. An airsoft speedloader is required to load BBs into these magazines (which is not included). We recommend our Valken SMG adapter so you can use these airsoft magazines with any M4/M16 airsoft electric rifle.