{"product_id":"magnetic-field-pattern-window","title":"Magnetic Field Pattern Window","description":"A white frame with transparent window containing magnetic powder in a water based solution for showing magnetic field patterns. When a magnet is present the particles of iron inside become slightly magnetized, so they attract each other and cluster into the lines that show the magnetic field patterns. Includes a pair of small ferrite block magnets and a pair of plastic cased bar magnets and teachers leaflet. Ages 3+","brand":"SI Manufacturing","offers":[{"title":"Default Title","offer_id":49961224896789,"sku":"SI50143","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/4897\/3845\/files\/50143.jpg?v=1781065817","url":"https:\/\/unitedsupplycorp.com\/products\/magnetic-field-pattern-window","provider":"United Supply Corp.","version":"1.0","type":"link"}