ABC Spell. F is for fun. Build 2019;n Learn ABC Spell. First Builders from mega bloks are the perfect tools for educational, imaginative play. With 52 letters, these big, vibrant blocks support your child 2019;s language development, encouraging letter recognition and basic spelling skills. These blocks are compatible with all mega bloks first builders sets and come in a new, PVC-free bag with strap for easy cleanup. Watch your little one grow with build 2019;n Learn ABC Spell. First builders by mega bloks. Ideal for ages one to five.