Adhesive Lined Dual Wall Heatshrink Tubing Black 3mm with 25mm length.Pre-Cut Lengths of 25mm3.0mm x 25.00mmShrink ratio: 3:1Quantity: 100 piecesWhen heat is applied using a heat gun or other hot air tool, the inner adhesive wall melts and flows, creating an adhesive layer to ensure a secure water tight seal.Size (mm) 3/1Inside diameter (mm)Expanded (min)3.2 Recovered (max)0.6Wall thickness (mm)Recovered nom. (inner liner)0.96 (0.35)Quantity 100