Lucklovely Empty Heat Sealing Nylon Pyramid Tea Filter Bags for Loose Tea (100) Tea bag is single-use, disposable tea infuser for steeping high-quality loose leaf tea or herbs Steep tea with a more robust flavor without the hassle or mess of conventional straining Food nylon will not taint the flavor of brewed tea Steeping all types of tea, including black tea, oolong tea, green tea, chai, chamomile and other herbal tea too The bag we provided are empty, after put into tea, then heat sealed the diagonal, final it will be triangle.