Features RUBBER MATERIAL: Made of durable rubber, this hat is flexible, hard to tear, strong for long term use. LEAK PREVENTION: Ensure close coordination to prevent vacuum leakage. Help you perform accurate and stable work, improve work efficiency. 80 pieces: 80 pieces heat resistant rubber vacuum lids in 6 different specifications, use for different scenes. HIGH TEMPERATURE RESISTANT: Tolerates high temperatures between 352 and 410 degrees ℉, strong and stable for long term use. EASY CARRYING - With a storage box and also being lightweight, this vacuum hat set is easy to carry for convenient use. Specification: Item Type: Vacuum Cap Assortment Kit Material: Rubber The black color Package list: 5 x 3/8 inch vacuum cap 20 x 3/16 inch vacuum cap 20 x 5/32 inch vacuum cap 20 x 7/32 inch vacuum cap 10 x 1/4 inch vacuum cap 5 x 5/16 inch vacuum cap 1 x plastic box Package List 5 x Vacuum Hat 3/8in 20 x Vacuum Hat 3/16in 20 x Vacuum Hat 5/32in 20 x Vacuum Hat 7/32in 10 x Vacuum Hat 1/4in 5 x Vacuum Hat 5/16in 1 x Plastic Box