Tip sets are a convenient and economical way to try a variety of tip shapes. We have designed these sets for specific users (pyrographers, bird carvers, gourd artists, etc.), so selecting just the right tip assortment could not be easier! All tips will fit in the #BPH interchangeable-tip pen. We highly recommend that you get at least 2 pens; this will make changing tips much easier because you will never have to change tips in a hot pen.