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Control horn has pins intended to be pressed into foam. Can be installed in balsa also. 22mm long, control radius 6mm. Note, control radius given if hinge line were at same surface as horn mounting. If you put this horn on 3mm material that is center hinged, your control radius would be +1.5mm. If hinged at opposite surface control radius would be +3mm. Material is .032 (.8mm) G10 fiberglass. 8 horns per package.
 "RRC Surface Horn #1 8-Pack")