1.compared with ordinary double 24tube, avirulent insipidity. 2.will not turn yellow 3.resilicence force is strong 1.materials:100% silicone material2.certificate:FDA.SGS3.suitable for different enviroment4.dust proof, waterproof,seal,suspension5.non-toxic, insipidity. accord with environmental protection concept6.the charge of the sample fee:free7.package:customized or double package which is ...