{"product_id":"ph0351aplrngscrw","title":"Replacement Ring \u0026 Screw for Hall's Friction Cars (PH0351APL)","description":"\u003cul\u003e\n\u003cli\u003eOne each replacement ring and screw for Hall's Friction Cars (PH0351APL)\u003c\/li\u003e\n\u003cli\u003eRing measures 2.75 inches in diameter and approx. 0.3 inches high. Screw measures approx. 1 inch long\u003c\/li\u003e\n\u003c\/ul\u003e\nOne each replacement ring and screw for Hall's Friction Cars (PH0351APL). Ring measures 2.75\" in diameter and approximately 0.3\" high. Screw measures approximately 1\" long.?áThe rings, when attached to the Halls cars, help ensure the cars bounce off of one another elastically so that the kinetic energy is the same before and after the collision.","brand":"Eisco Labs","offers":[{"title":"Default Title","offer_id":42610835980480,"sku":"PH0351APLRNGSCRW","price":7.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/0623\/products\/PH0351APLRNGSCRW.jpg?v=1759453572","url":"https:\/\/www.thelabstockroom.com\/products\/ph0351aplrngscrw","provider":"The Lab Stockroom","version":"1.0","type":"link"}