Glasslock Oven Safe 14-Piece Set FOR $18.99. Shipping is free on orders over $49. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for your reference. Glasslock is made of silica, soda ash, limestone, and other natural components, making it more eco-friendly and recyclable. It is BPA free and does not contain any harmful environmental hormones.