1 We use differenttypes to fit different customers' need. We have two grades :A and B.And two types : standard form and handle form. 2Made of PE Holds tile securely in place for quick and accurate installation Precision molded, not extruded, for strength and stability. 3 size :1.0,1.5,2.0,2.5,3.0,4.0,5.0,6.0,8.0 and 10.0mm