I can send up to two mouthpieces and 2 barrels or extensions in one trial order. You must purchases all of the items first. You have 2 weeks to return them from the date I ship your package. If you do not purchase any of the trial items your trial fee is 5% of the total not to exceed $25, Trials apply ONLY to 10K and 10K CWF mouthpieces, NOVA mouthpieces and all wood products. Ligatures cannot be sent on trial.