Crazy Contraptions: Build Rube Goldberg Machines that Swoop, Spin, Stack, and Swivel: with Hands-On Engineering Activities

WSYCWG 99.9% Pure Copper Rod Length 400Mm, T2 Copper Solid Bar Suitable for Metal Craft Electrical and Industrial,Diameter 30mm

WSYCWG Copper Rod Length 200Mm, T2 Copper Round Rod Lathe Bar Industrial Raw Materials Perfect for Engineering and DIY Projects,Diameter 40mm

Copper Bar Round for Industrial Parts Length 100/500MM, Phosphor Bronze Bar Diam 1-35mm 1pc, Tin Phosphorous Copper Rod(18X500MM)

WSYCWG Copper Solid Copper Rod Length 100Mm, Raw Materials Diameter 45-65Mm Ideal for DIY Crafts and Industrial Applications,Diameter 60mm

Copper Bar Round for Industrial Parts Length 100/500MM, Phosphor Bronze Bar Diam 1-35mm 1pc, Tin Phosphorous Copper Rod(7X500MM)

WSYCWG Pure Copper Rod Raw Materials Length 150Mm, Solid Copper Rod Lathe Bar Diameter 18-28Mm Suitable for Industrial Applications,Diameter 28mm

KINGBOLEN K7 OBD2 Scanner Bluetooth with BM520 6V 12V 24V Car Battery Tester Bundle, Bidirectional Scan Tool, 31+ Resets, FCA AutoAuth, 3-Year Update

Bottle Stopper Compatible with Stanley, Tight Vacuum Flask Mouth Watertight Water Bottle Cap Lid Stopper Replacement Vacuum Cup Insulated Accessories for 1 QT, 1.1 QT, 1.5 QT, 2 QT, 2.5 QT (Black)