Water-based glue specifically suitable for gluing long pimpled rubbers and topsheets to the sponge (the Vortex with the Magic Sponges for example). You should apply one layer of the glue to the rubber and one to the blade. The glue complies to the International Federation ITTF and FITET guidelines. It comes in a 100 ml package with a tweezer and comfortable sponges to apply the glue.