Foxpro CSMOUTHBACKWING Crooked Spur Back Wing Diaphragm Call Triple Reed Turkey Sounds Attracts Turkeys Green FOXPRO's Crooked Spur Series Mouth calls offer a wide range of tone, pitch and realism and are easy to use. Turkey hunters know when prophylactic is stretched properly it can produce the most realistic sounds available in a diaphragm call. It offers a combination of prophylactic and latex to give you the best advantage in the woods. The call features a pad printed design on each call.