Wood logs

Regarding the logs of guanacaste (enterolobium cyclocarpum) from panamenian rain forest. Volume formula: brereton d^2 * l * 0.7854 d = (d1+d2+d3+d4) 4 length 2.5-3m, measurment under bark. Prices are: ( not negotiable) diameter 60-99cm+ 560 usdm3 fob diameter 100-150cm+ 710 usdm3 fob we load 70% of 100cm+ and 30% of 60-99cm for each order. Port of loading balboa, panama we can load up to 6 x 40ft containers per month.