The Ring Writer Clip is so simple and intuitive to use. Place a finger or thumb in the larger ring and slide an implement into the smaller ring. The implement is naturally positioned and angled correctly, ready to use without the need for gripping ability. It is ideal for use with pens, pencils, crayons, paint brushes, tooth brushes. 3 different sized Ring Writer Clips per bag - 1 each: Small .58" (1.47 cm) ID, Medium .73" (1.85 cm) ID, Large .87" (2.21 cm) ID. Ring Writer™ Clip, (Includes 3 sizes) 736070000-1$8.30 If you have any questions or need help, just call us, 973.305.0006