There is no doubt that it can exercise your hands-on ability and logical thinking effectively by installing them. You also can learn basic physics knowledge before go to school. With this product,it suitable for most students and children because of it is easy enough for them.At the same time it has variety experiment and excellent electronic kit. It is made from electronic component and metal, is wearable to use. The length of the product is 12.5 cm, the width is 10.5 cm and the thickness is 1.7 cm. Our product is suitable for educating. Item Name: Physics Experiment Set Material: Metal,Electronic Component Features: Safe, Easy to Assemble, Stable Current Color: Random Size Details: 12.5cm x 10.5cm x 1.7cm/4.92" x 4.13" x 0.67" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Nail 1 x Battery Card Slot 1 x Small Bulb 2 x Paper Clip 2 x Fuse Clamp 2 x Fuse 1 x Experimental Battery Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.