... PEX-AL-PEX bending spring for choice:ModelSPTBS-001Product namePEX-AL-PEX Internal Bending SpringAvailable sizes16mm ... or 20mm or 26mm or 32mmMaterial usedSpring steelColors availableBlack, Silvery, Bronze, or customized madeSamples availableYes, sample available for ... ModelSPTBS-002Product namePEX-AL-PEX External Bending SpringAvailable sizes16mm or 20mm or 26mm or ...