Made of durable, long-lasting acrylic, a transparent thermoplastic that's lightweight yet solid. The 3-Piece Acrylic Grinder is shatter-resistant, making it an excellent companion for on-the-go vaping or smoking. The 3-Piece Grinder is an inexpensive but useful grinder for dry herb enthusiasts on a budget. While the acrylic grinder doesn't have a kief catcher like 4-piece grinders do, it does a marvelous job of grind down dry herb, preparing it for even and thorough vaporization. The Acrylic Herb Grinder is an affordable, functional, and portable tool for properly grinding down dry herb.