Building contruction set contains 113 pieces total, 11 construction bricks, 2 light up power bricks with 4 LEDs total, batteries & instruction manual. 100% compatible with other major construction bricks and building block sets. This construction set and its bricks are compatible with all Laser Pegs kits and all other major construction brands such as Lego®, Mega Bloks®, Magformers®, Magna Tiles®, Tegu®, Playmobile®. Construction bricks are educational and stimulate imagination and creativity with unlimitied building possibilities. Laser Pegs are a classic building toy allowing kids to build anything from helicopters to robots, monster trucks to animals, or dinosaurs to spaceships! All Laser Pegs kits can build multiple models and can be combined with all major building blocks such as Lego®, Knex®, Mega Bloks®, Magformers®.