For ages 7+ years. Warning: CHOKING HAZARD - Small Parts. For ages 7+ years. Warning: CHOKING HAZARD - Small Parts. Build your own medieval siege engine from pre-drilled planks, a little glue and the help of easy, step-by-step "blueprint" instructions. Then let the fun and experimentation begin! What travels farther: a marshmallow or a piece of macaroni? Alter the counterweight to adjust the trebuchet(s hurl, and practice knocking down a field of target planks using the two included balls.