Light up your toy creations with the 34593 Builder Light Set – the perfect STEM building toy to challenge the imagination of budding engineers. This open-ended toy construction set comes with 120 play components, battery-powered light components and easy-to-use tools to help build your creations. The light components feature four different modes for added details; ON, OFF, blinking and pulsating, and work perfectly with the transparent plastic parts that come in a variety of colours.