Features:Build 6 different models.Differs from other tropid model toys， they will move after assembled.Solar energy provide motive force.Do not need screws， so no tools is employed.Teach through lively activities.Solar battery life-span: 3-5 years.Material: Polyethylene.Safe and durable.Age for: 10+.NOTE: This kit include small parts， not for children under 3 years in case of choking hazard， The children under 10 years must accompanied by adult.Package Content: 1x Pack of Solar DIY Model