Rexius small grade fir bark is the only fir bark available which is heat treated to completely destroy fungi, bacteria, insects and snails. Pre-soak for 24 hours before use as this material is very dry. This grade is best for smaller Paphs and Phrags and seedlings of most everything else. The particle size is from 1/4 to 1/2 inch on average. The best bark around! Approx. FedEx Ground shipping on 1 bag: $15-25, 2 bags: $35+, depending on region.