Resin dice is very similar with plastic dice from apperance, but it is one of 100% handmade crafts. Silicone mold will be used for resin dice which is low cost and short time (10 days) making. Silicone mold is affected by temperature obviously. That is “ heat makes something expand and cold makes it contract”. So there will be 2-3 mm size difference even if same batch of bulk. And resin dice requires longer time on polish to achieve great finish. As a professional supplier, we will let our customers know about the workmanship before bulk production to avoid any mistakes.