It fits All the Essential Oil Diffuser Necklace, Bracelet, Car Air Vent Clip with That Size Refill Pads. Cost-effective, and All of the Replacement Pads are in Good High Quality. In Order to Make It Being Super Absorbent for the Smell Last Longer. It is Also Nontoxic. DURABLE and RECYCLE -This Refill Felt Can Be Reused After Being Washed By Water. If You Do Not Want to Change Another Smell, You Can Drop the Essential Oil to Another Refill Pad and Wash the Using One, Air Drying, Wait for Be Used Next Time. EASY to USE - Put the Essential Oil Diffuser Refilled Pads into Your Necklace, Bracelets or Car Clips; Drop the Essential Oil According to Your Test. Colour:Random colors (specified colors are not accepted) Material:Felt Size:Diameter: 22mm Thickness: 3mm Package Contents: 150 * Replacement Pads Only the above package content, other products are not included. Note: Light reflection 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.