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tmej springs are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from materials with a round cross-section. When not under load, the coils of an extension spring are typically closed together with no gaps. Many different terminal devices or "hooks" are used to ensure the source of tension for the extension spring. The working principle of extension springs is opposite to that of compression springs. Compression springs exert a reactive force when compressed, whereas extension springs exert a reactive force when extended or pulled apart. When the two ends of an extension spring are pulled apart, the spring attempts to pull them back together. Like compression springs, extension spr