Hydraulic Mechanical Arm DIY Models Building Toy Science Educational Model Toy Children Birthday Gift Material: Wood Color: as the picture shows, (Due to the difference between different monitors, the picture may have slight color difference. please make sure you do not mind before ordering, Thank you!)〓★ Activities for Toddlers 1-3,Toddler Magnets for Refrigerator,Animal Matching Game Head And Tails,Battery Operated Car Vintage,Thick It,Alphabet Game Board,Big Magnets for Kids,Big Worm on A String,Foam Cubes,Magnets for Kids,Multiplication,Multiplication Table,Alphabet Bathtub Letters,Alphabet Board Games for Toddlers,Fidgets for School,Bathtub Letters for Toddlers,Bead Set for Kids 4-6 Boys,Animal Magnets for Toddlers 1-3,Hot Dots Kindergarten,Sensory Bottles,Addition Math Facts Games,Alphabet Games for Toddlers,Alphabet Games for Toddlers 2-4 Years,Bead Magnets,Multiplication Games,Toddler Magnets,Beehive Game Kids Wooden,Alphabet Board for Toddlers 2-4 Years developmental toys for 2 year old developmental toys for 2+ year old developmental toys 10 months developmental toys 18-24 months developmental toys for babies 6-12 months developmental toys developmental toys for babies 3-6 months developmental toys for babies 0-3 months developmental toys 9-12 months developmental toys for 129 year old girl Wood Material, And Non-, For Use,Let The Child Understand How The Robotic Arm Works. Hydraulic Transmission Is A Kind Of Transmission Mode That Uses The Pressurized Liquid In The Closed System To Transfer Motion And Power. Cultivate Children's Ability To Use Both Hands And Brain,Allows Children To Experience The Fun Of DIY. Package List:1 Set X Mechanical Arm DIY Toys The Mechanical Energy Is To The Pressure Energy Of The Liquid,and Then The Pressure Energy Of The Liquid Is To Mechanical Energy.