Low-density polyethylene bottles and spouts with sealer caps. Sealer snaps on easily after use and gives a tight seal. Spout openings are standard 0.03". Opening can be enlarged by cutting back with scissors. These are great bottles for dispensing both water based and solvent based adhesives. A word of warning, solvent based products will attack the low-density polyethylene. Don't use these bottles for long term storage of solvent based products. These bottles are sold by the dozen.