"PIAA Bulbs are scientifically engineered using the latest techology to produce the highest quality and advanced bulbs on the market today

Design Features:
- High quality heat resistant glass
- Welded focus ring that assures correct positioning
- Provides brighter and whiter light for less power
- One piece filament support allows correct support and positioning
- A metal bond holds the glass tube, preventing cracks and leaks"

(taken from the PIAA Website - www.piaa.co.uk)