Yes, Eclipse Glasses (EC-GL50), are safe for viewing the sun. Their manufacturer, Rainbow Symphony, Inc., states the following on their website http://eclipseshades.com:

Eclipse Shades lenses are made of our exclusive scratch resistant optical density 5, “Black Polymer” material. Eclipse Shades filter out 100% of harmful ultra-violet, 100% of harmful infrared and 99.999% of intense visible light. These premium filters create a sharper ORANGE colored image of the sun. The backside of the eclipse glasses is printed with safety information.

All of our solar viewing materials are optical density 5 or greater and are “CE” certified which meets the transmission requirements of scale 12-16 of EN 169/1992. All our eclipse glasses meets the 2012 Transmission Requirements of EN 1836:2005 & AS/NZS 1338.1:1992 for Eclipse filters. (Queensland Directive)

To learn more about the manufacturer, Rainbow Symphony, Inc, please visit their website:
https://www.rainbowsymphonystore.com/