Minimum of 165 coils WITH SHORT CHAIN and at least two swivels. Nbr 2 double longspring will hold yotes but is a minimum and needs some mods. Nbr 3 double longspring spring is better...... I could go on but it sounds like you havent trapped yotes before and there is alot of other things to learn too so dont be bashful asking questions.... We want you to do it right and enjoy trapping yotes.