Pen Holder Clips- Self Adhesive Pen Pencil Holder Pen Clip Holder with Adjustable Spring Loop Fit Any Size Pens 16 Pack Retractable ring: This metal pen holder is equipped with adjustable spring rings. The diameter of each ring can be expanded from 7 mm to 17 mm, which can accommodate most sizes of pens or pencils Durable material: These pen holders are made of metal and can be used for a long time; the adhesive design on the back brings convenience and is suitable for most occasions Wide range of applications: These pen holders can be clamped on whiteboards, refrigerators, wipe boards, bulletin boards, maps, calendars and other dry surfaces, and can even be a good help for storing shopping lists, pens, pencils, etc.Also are useful gifts to students, teachers, postmen, s, nurses. colour: black Material: metal size: diameter: 18mm Package Contents: 16 x pen holder Note: Small items. please keep them away from children under 3 years old. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.