... 3.Very fleible,High flame Environment friendly heat shrink sleeveKOSOO K-2Environment friendly, flexible, flame-retardant ... identification and color coding, etc.Features/Benefits·Shrink ratio: 2:1.·Very flexible, highly flame-retardant.· ... colors. Operating Temperature RangeOperating temperature range: -55~135Minimum shrink temperature: 70Minimum full recovery temperature: 110 Standards/ApprovalsUL224 ...