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Product Name: Compressed Spring Free Length: 20mm/0.79"Spring Size( Outer Diameter): 4mm/0.16"(OD)Wire Diameter: 0.5mm/0.016"Main Material: Stainless Steel Package Content: 10pcs x Compressed Spring Made of Stainless steel spring wirel in silver tone, features high elasticity and good precision, installed small size and generate strong force.Spring ends are closed and ground flat (squared) for efficient force transfer and reduced possibility of tanglingStainless Steel offers good mechanical properties with greater corrosion and heat resistance than music wireGeneral use spring toys equipment tools etc.