diff --git a/types.go b/types.go
index 941e781..fe293c0 100644
--- a/types.go
+++ b/types.go
@@ -6,20 +6,7 @@ type UserAgent string
 const(
 	UserAgentChrome UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
 	UserAgentFirefox UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 "
-	UserAgentSafari UserAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 "
-	UserAgentOpera UserAgent = "Opera/9.80 (Windows NT 6.1; WOW64) Presto/2.12.388 Version/12.18 "
 	UserAgentIE UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; "
 	UserAgentEdge UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
-	UserAgentQQ UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; "
-	UserAgentMaxthon UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 "
-	UserAgentUC UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 "
-	UserAgentSougou UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentLBBROWSER UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgent2345 UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentQihu UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentXiaoMi UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentQuark UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentQiyu UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
 	UserAgentWechat UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
-	UserAgentTaobao UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 "
 )
\ No newline at end of file