theres actually two sets.You only need one.You CA them to gether like you would the fin and stab. Make sure the fin is centered and straight just like you would when mounting the actual one. Make sure you just take glue the stab section to the plane or it ll be a mess when you go to remove. Then you take glue the the wood stock in place and carefully carve it to a ruff shape.Then switch to 80 grit and sand it shape finishing it off with 220 grit or better. When you done, slide a razor inbetween popping them loose.And your done with the mock fin and stab.Pop thos loose the same way and you done. I believe that covers it.I m sure if I didin t someone will correct me and say it better.