The Foos wood carving set is 4 pieces total, solid carbide, 1/4” shank router bits. A 20° profile bit for etching and outlining. A 15° carving liner for fine lines and details. Also, both a 60° & 90° For multiple background depths. We use premium carbide to ensure our bits stay sharp and provide nice clean cuts. We are veteran owned and stand by our product 100%. If you ever see that our prices change and you missed out on a sale, just contact us with your order # and we will send you out a bit on us to make up for it. Also!!! Checkout our store!