Forge World models are made of a special resin, allowing for a greater level of detail. Forge World resin behaves a little differently from plastic, metal or finecast resin, and needs some extra care to work with - if you've just bought something new for the new edition, Duncan is on hand with a guide to assembling your Forge World models with minimal fuss. https://goo.gl/HsAUUK | Warhammer: The Horus Heresy