The GorillaGrip Non Slip Coasters are a set of two square-shaped coasters designed to prevent slipping. Made by the brand GorillaGrip, these clear coasters are perfect for protecting surfaces and keeping drinks in place. Ideal for use in bars, kitchens, or dining areas, these coasters are a practical and stylish addition to any home. Did not believe picture on package so tested one for myself (please see final picture). Please note the angle/level of the water in the plastic cup which confirms that these coasters are effective!