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Instant Breathing Comfort: Delivers flexible 2-3cm expansion around constricting shirt collars and waistbands to relieve choking sensation without altering original tailoring Versatile 5-Style Assortment: Features 3 patterned zinc alloy metal designs and 2 classic resin plastic styles across ten 10mm expanders to match formal shirts and casual trousers Durable Flexible Spring Loop: Crafted with sturdy button faces and resilient stainless steel spring coils that stretch smoothly without snapping or losing elastic tension Tool-Free No-Sew Attachment: Loops effortlessly around existing garment buttons in seconds without stitching needles or permanent fabric modifications Broad Garment Compatibility: Compatible with formal dress shirts tuxedo collars suit trousers jeans skirts maternity waistlines and workwear buttonholes