This assortment includes 250 Buna-N O-rings with a 70 Durometer rating, featuring a material thickness of 1/8 inch. The inside dimensions range from 1-5/8 inches to 2-3/4 inches, while the outside dimensions vary from 1-7/8 inches to 3 inches. Each size is represented by 25 pieces, neatly organized in a durable 12-hole metal parts box, making it convenient for various automotive and industrial applications. These O-rings provide reliable sealing and are suitable for a wide range of fluids and environments.