Russian Piping Tips Coupler, MCIRCO 4 Pieces Large Size Single Bag Piping Tip Couplers for Large Size Icing Nozzels to Quickly & Easily Attach and Swap Piping Tips Cake Decorating Supplies Tools Package includes 4 piece russian tip couplers. Made of BPA free, high quality plastic, safe for you and your beloved.ones Russian piping tip coupler for large size Russian piping tips to make more beautiful decorations. The coupler is only compatible with russian piping tip which measures 1.38" in diameter at the base of it. Easy and quick to change the tip in your work with one pastry bag. You are recommended to check the specifications carefully before your purchase. Please note that we would be happy to issue you a full refund or send you a replacement if you have any dissatisfaction with your order. JUST CONTACT SELLER AGAINST YOUR ORDER# IF YOU HAVE ANY CONCERNS.