Icicles Hand Blow Glass Ben Wa Balls No.42. Medium Glass Ben Wa Balls measures 1.2 inches or 30mm in diameter. Elegant, upscale, and hand-crafted with amazing attention to detail, these luxurious glass Ben-Wa balls are made from borosilicate glass and designed to last a lifetime. Their size and weight make them perfect for vaginal stimulation and exercise use, and the nonporous glass is hypoallergenic and body safe. With regular use, you will enjoy improved muscle control and stronger, more frequent orgasms. Run them under warm water or place them in the microwave to heat things up. Chill them under cold water or put them in the freezer for a cool sensation. Cleanup is a snap after the fun with Pipedream toy cleaner and warm water. Material:Glass. Country of origin China. Pipedream Products Catalogs featured in 2010 Icicles, page 15 and 2012 Icicles, page 14.