Slap Band

A long, flat strip of bistable flexible steel, sealed within a decorative fabric, silicone, or plastic cover, that instantly curls into a fitted bracelet when "slapped" or tapped against a wrist or other object.

Here are the key characteristics that make up the description:

• Core Mechanism: A flexible, pre-tensioned bistable spring band (often repurposed from materials like a metal measuring tape).

• Action: It has two stable states—straight and coiled—and a small force (the "slap") triggers the rapid, satisfying transition to the coiled state.

• Appearance/Material: The internal metal is covered for safety and comfort, typically with silicone or fabric, and comes in a wide variety of colors, patterns, and designs.

• Function: It is an adjustable, one-size-fits-most novelty accessory, popular as a toy, fashion item, and promotional giveaway.