3.5" slate of your preference and a hickory stiker.  Add cedar, poplar and other softwood strikers and lighten your pressure as needed. Find something you and the birds like.   A 2 sider slate with aluminum or ceramic can add another hen for locating or longer range work in one call. Use a harder striker for that surface if desired.  I like black locust for all around calling too. I  Good luck with em.