OVAL AND STOP SLEEVES Sleeves for eye, lap, and stop sleeve splicing are available in either aluminum, copper, or, in some cases, zinc plated copper in a wide variety of sizes ranging from 3/64 to 1/2. All oval sleeves (copper or aluminum) are capable of supporting a load 40 to 60 percent of the rated breaking strength of the cable to which they are attached. Stop sleeves are capable of holding only 1/3 to 1/2 of the rated breaking strength of the cable to which they are attached.