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 150 Lbs crossbows (MK-150 series). Whether you want a durable upgrade, or just to have a spare, this prod performs consistently in all conditions. Included is the high performance fiberglass prod, two nock ends, steel plate, and stick-on pads.