orthodontic spacing spring with consistent force

{"cid":"91222511","title":"Rotating Spring Right Left 10x1 Orthodontic Coil Spring For Teeth Alignment","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/f5\/69\/89f4a2618e6ce065f42b5ac4dc86-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"Wise Medical","Model Number":"MY-02012","Minimum Order Quantity":"negotiation","Delivery Time":"7 Days","Place of Origin":"HangZhou","Function":"orthodontic use","Warranty":"2 years, 2years","Product Name":"Rotating Spring","Type":"right\/left","Material":"medical stainless steel","Paking":"10 pcs\/pack","Certificate":"CE ISO","Delivery":"Fedex UPS"}}

{"cid":"91222823","title":"KGS-M1348-00X YAMAHA YG12 GAS SPRING Yamaha board","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/4e\/03\/ce562a83728a5e72ba5e6eff1a26-200x200-1.jpg","attrs":{"Price":"US$0.30 ~ US$2.00","Brand Name":"Yamaha","Model Number":"KGS-M1348-00X","Minimum Order Quantity":"1","Delivery Time":"1~2 days","Payment Terms":"100% in advance","Packaging Details":"Carton packaging","Description":"YAMAHA GAS SPRING","Part number":"KGS-M1348-00X","Suitable for":"Yamaha","Condition:":"Original new\/Copy new","Min Order Qty":"1","Lead time":"1~2days","Warranty":"1month","Shipment":"FEDEX DHL TNT UPS"}}

{"cid":"91196434","title":"0.5mm Titanium Wire Elastic Memory Nitinol Alloy Wire ASTM F2063","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/0e\/25\/bdd2b3f424df98552b6195dabe42-200x200-1.jpg","attrs":{"Price":"","Brand Name":"LHTi","Model Number":"Titanium Wire","Minimum Order Quantity":"10kg","Delivery Time":"10-15working days","Certification":"ISO9001","Place of Origin":"China","Payment Terms":"L\/C, D\/A, T\/T, Western Union","Supply Ability":"1000 Kilogram\/Kilograms per Month","Packaging Details":"Plywood case and then tied by steel band. The packaging will keep the goods more secure when in long distance transportation.","Model NumbeTITANIUM WIREr":"Titanium Wire","Application":"INDUSTRY","Ti (Min)":"90%","Processing Service":"Bending, Welding, Cutting","Material":"Pure Titanium Titanium Alloy","Standard":"ASTMF2063-2012","Surface":"Pickling Polished","Color":"Metal Color","MOQ":"10kg","Package":"Wooden Case","Key words":"ASTM F2063 0.5mm nitinol wire","Key words 2":"Titanium Wire","Shape":"Round"}}