Make the long, steep way uphill a little easier. The Spark R&D Pin Binding Dual Height Wire heel lifter give you 12° and 18° climbing angles for smooth skinning on the steeps. FeaturesCompatible with Spark or Voile pin mount bindings.made in-house at Spark R&D.Weight: 2.61oz/ea (74g) - 5.22oz/pr (148g)