Economy Magnum Stinger Kill Spring ™ - A larger version of the Stinger Kill Spring. More than twice the power of the standard Stinger, much longer throw length has twice the ability compared to the original spring. Designed for wolves, it has proven it’s value both on wolf and also in the coyote lands on coyote. Recommended to be used with a powersnare trigger in a powersnare application only. Clip the trigger to the wire-end/dead-end side of the spring loop; will cause loop to flex and aid the firing of the device even on small animals such as fox. Economy spring is made of music wire spring wire and is equally as strong as the Deluxe, but is prone to rust. The Economy Stinger Kill Spring is an authentic Senneker product, not to be confused with any low value spring knock off.