12-Piece Baking Tool Set: Piping Tube, Piping Bags, Coupler Product Composition Set: 1 Piping Tube 1 Coupler 10 Piping Bags Total: 12 pieces. Materials: Piping Bags: PE material. Coupler: PP material. Piping Tube: ABS material. Size: See image How to Use: See image Applicable Tip Size: Bottom diameter 1.8 cm (see tip image). Uses: For decorating with whipped cream, cookies, chocolate, bean paste, etc., when creating patterns. The pull-out plunger allows for smooth operation, controlling the amount and speed of filling and icing. This kit is easy to control, and all tips are removable for easy cleaning. A convenient coupler (small) and piping bags are included, allowing you to change tips while the cream is still inside. After cleaning, wipe off the moisture and store in a well-ventilated place.