You are buying 25 feet of 1.25" ......BLACK color expandable sleeving.

 P.E.T. -- melt temp. is 482 deg.F. -- max. continious temp. is 257deg.F

relaxed it is 3/4" (min. diam) ---- expanded it is 1.75"  (max. diam.) 

.....It is a PET PRODUCT....