Spacer Beads

and what do these products mean and should i get them...??

1 x Bearing Spacers, 11.2mm +$3.59

1 x Khiro Nitro Bearing Lube +$4.49

1 x Bones Bearing Speed Cream, 1/2 oz +$4.49

2 x Kingpin 2.5", Grade 5 +$4.36

2 x Kingpin 2.75", Grade 8, Zinc Coated +$3.58

2 x Kingpin 3", Grade 8, Zinc Coated +$3.58

2 x Randal Titanium Kingpin, 3" +$66.51

also one more thing in this video what bushings is he using tall ones or small ones r what..lol..oh and do you get that much in a pack to put two at front tow at back...??