The acrylic pen in this set is ergonomically shaped for better hand comfort while diamond painting. Normal thin pens can lead to hand cramps which can be alleviated by the use of a thicker, pen designed for comfort. The single placement tip is designed to place one drill (diamond) at a time with the use of diamond art wax. The 9 drill placement tool allows you to fill it with diamond art wax, pick up and place up to 9 drills at a time. The roller pen applicator includes a roller tip, and a large amount of double sided tape. You place this tape on the applicator wheel, and use this to pick up a line of diamonds and roll them into place.Details:Blue6.1" x 1.65" package size5 piecesDiamond art wax sold separatelyContents:1 single placement tip1 9 drill placement tip1 roller pen applicator tip1 double-sided roll of tape1 acrylic pen