These swords are designed by Buick Yip (with Everything Wing Chun collaboration for v9 onwards).  They are generally very popular swords as they are a really good quality for the price. Many copy-cat companies in China try to duplicate these blades. Here you will find the originals and latest models, with Buick's handwriting engraved on many of the swords.

These swords are made from high-grade plastic.  They are great for forms practice, weapon chi sao, and (very) light sparing/weapons training.  They are light and tough.