Amercian made factory original silicone based elastomer lamp sleeves are designed to withstand high bulb temperatures.
These sleeves can actually extend bulb life by up to 6% by acting as a heat sink for the lamp. Made in USA
For use on No.44, No.47, No.555 and all similar shape miniature lamps. Also available in red, yellow, green, and white.
Reference:
Williams 03-8063-1
Gottlieb 24875W
Data East / Sega / Stern 545-5014-05