All metal construction. Unlike thecompetition, Westcott speed rings are constructed using a solid, die-cast framework which adds strength and longevity to the product. Westcott speedrings are designed to rotate 360-degrees once place on the light head. This is done by placing Teflon washers between the center insert and the outer ring offering a smooth transition when rotating the inner ring. Lightweight design. Units are constructed from lightweight and durable aluminum. One ring fits all! This versatile design allows for use with a softbox, Stripbank or Octabank.