Professor Gauss Magnetic Putty with Skittle Magnet - Black Goo (Pack of 1)

Professor Gauss™ Magnetic Putty with Skittle Magnet for Kids, Boy, Girl, Science, Learning, and Fun - Black Goo

The Glowhouse Colour Changing Smart Putty Purple to Blue Heat Sensitive

myHodo Colourful Crack Magnets (575+ Pieces, 5-7mm) – Versatile Magnetic Stones for ASMR, Creativity & Stress Relief – Mini Magnets Set - Fun Gadget for Home & Office (8 Colours)