While most of the Children At Play signs come in aluminum metal, we do offer some plastic sign options as well. Our Slow Children At Play Sign and Slow Autistic Child At Play Sign are 160 mil thick corrugated plastic. 24 x 36 inch signs are very lightweight and easily slide into a pre-slotted BigBoss Sign frame. Plastic sign panels also come with our Mini A-Frame sign kits. Also, our ConeBoss Signs are made of 3/16 inch thick plastic. Printed on both sides, these cone top signs fit snugly over most common size traffic cones.