This transparent heat shrink sleeve is designed to shrink uniformly when heat is applied, providing a secure and tight cover. With a shrink ratio of 2/1, this heat shrink will fit perfectly around your batteries, providing additional protection against moisture, dust, and mechanical damage. Translation: <p>This transparent heat shrink sleeve is designed to shrink uniformly when heat is applied, providing a secure and tight cover. With a shrink ratio of 2/1, this heat shrink will fit perfectly around your batteries, providing additional protection against moisture, dust, and mechanical damage.</p>