Safelab Micro Tube with + cut Rubber Caps are with sealed Butyl Rubber stopper is designed with central cross insertion on top for inserting capillary tubes. After blood collection, the cross insertion automatically sealed up when the capillary is pulled out, which effectively prevent blood leaking and guarantee safe and reliable transportation. Blood also can be collected by a funnel which needs to fix on the top of the cap. Very easy to insert automated instrument probes through the caps which is very convenient in testing.