Do these penclis erase easily without smudging?

I bought these pencils as a gift for a friend...I noticed his work when he was erasing...but I saw no smudge marks.

What do the numbers followed by a B or an H mean

Hard to Soft Graphite Pencils(6H, 4H, 2H, HB, B, 2B, 3B, 4B, 5B, 6B, 8B, 10B) The higher the H numbers, the harder the graphite, and the lighter tone it will create. B pencils are softer and make darker, richer tones. Use a variety of tones in your drawing to create depth and dimension. Dyvicl Graphite Sketching Pencil Set Artist Approved Sketch and Drawing Art Pencil Kit for Artists of All Skill Levels. Good gift for family, neighbors, friends. Best gift for Children.

Do these come in a reusable case?

i love the pensils, but no case... i also ordered compact and portable sketch folio which has a case and i use that set often, theres even an area for erasers etc.

Material Type	Wood
Item Weight	0.18 Pounds
Unit Count	12 Count
Body Shape	Round
Style Name	Professional
Color	12 Pcs
Grip Type	Hexagonal
Hand Orientation	Ambidextrous
Hardness	6H
Drill Point	Broad
Additional Features	Pre-Sharpened
Line Size	0.5 Millimeters
Writing Instrument Form	Graphite Pencil
Ink Color	Black

Drawing Sketching Pencils

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