Universal: The diameter of the glue board is 7.1 inches, it is suitable for most models sticky dome traps. NOTE do not use as a stand alone trap. Works in conjunction with light trap for indoor. Strong Sticky: These glue boards are so sticky, any tiny insects like fleas, gnats into the trap will be stuck on the board and can't escape. Long-Lasting: It is possible to use the board for up to 4 weeks. Easy to Use: Take one for bugs and peel off the plastic cover, then place the glue board on the bottom of a dome trap. Please attention the sticky side should not stick on the trap. Colour:White Material:White cardboard Size:Diameter about 18cm Package Contents: 12 * Fleas Trap Refill 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.