This bags are designed for the bakers and enthusiastic.Flexible, leak proof and strong.Made of heavy vinyl plastic with double welding.NEEDLE: 6" (14 Cm) Made of bronze and nickel bathed, which is non toxic and guaranteed durability.Designed for food.Needle hole: 1/4" Plastic adapter easy to disassemble and clean all parts This bags are designed for the bakers and enthusiastic.Flexible, leak proof and strong.Use these easy handling filler bags over and over.These are professional quality bags.