The 202A121-25/225-0 from TE Connectivity / Raychem Brand is black color heat shrink boot with shell size 21, 0.969" (24.61mm) to 0.390" (9.91mm) large diameter and 0.969" (24.61mm) to 0.209" (5.31mm) small diameter. This fluid resistant heat shrink boot is made of elastomer (semi-rigid) and has adhesive coating. Operating temperature range is from -75 to 150 °C ( -103 to 302 °F ).