Using a syringe and needle allows for precision placing of glue and a more precise design, with a lot less mess and no glue on top of the stones. The barrel needs to be seen as disposable when using E6000 type glue, though if you leave a little in the tip to harden you can pull it out and use the tip again. The water based glues are easier to clean from the barrel. Making stoning so much faster, syringe in one hand and picker in the other, so fast! Olive tip: 14 gauge - Largest tip good for thick glues like E6000 and Serious Glue Green tip: 18 gauge - Good with thick glues but the smaller stones Purple tip: 21 gauge - Good with more liquid glues like Gem Tac or Strass with its smaller tip Blue tip: 22 gauge - Smallest tip, best for delicate jobs and perfect for Gem Tac ONE TIP + ONE SYRINGE Syringes can be bought individually and extra tips as packs of 3