A crossbow prod is one of the most important parts of the crossbow. It provides a spring force that slings the arrow or projectile at piercing speeds. This prod is made for 130 Lbs crossbows (MK-180 series). Whether you want a durable upgrade, or just to have a spare, this prod performs consistently in all conditions. Included is both fiberglass prod sides and two ABS nock ends. Each fiberglass prod side features two reinforced mounting holes.