The plastic bottles with black flip caps are made of high quality plastic material and it will protect the products from sun light to prolong the effectiveness of the liquid products. Each bottle is made at the appropriate weight as a travel bottle, that is not too heavy or too hard to squeeze. At the same time, it's not too thin that the bottle would be distorted easily. Overall, it's a very good plastic travel bottle set for home made soap, hand sanitizer and other liquid you would like to carry everywhere at a reasonable price. You can also use it for party favors, wedding favors and other get togethers. he attached lids seal the bottles tightly and will not leak under any circumstances. Perfect for a facial toner, lotion, essential oil, makeup remover oil, cosmetics and etc. Transparent PET plastic bottle, the liquid can be squeezed out by lightly squeezing It uses a black flip top cap and the leak-proof design prevents liquid from leaking out.