It is a set of the spare Refills &Leads made specially for those who own Jet Stream 4 & 1.
Keep in mind that it does not fit normal Jet Stream.
It is smooth and they are a spare lead which cannot break easily, and the profitable set which attached Nano Daia (hot product of Uni) together.(HB 40 Leads)

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 0.6 inch
Height : 0.4 inch
Length : 5.5 inch

Item Weight: 0.32 ounce (View shipping rates and policies)
Shipping Weight: 0.32 ounce (View shipping rates and policies)

ASIN : B00GU2SKAY