One spoon - כף caph, a censer, on which they put the incense. See Exodus 25:29. It is worthy of remark that the different tribes are represented here as bringing their offerings precisely in the same order in which they encamped about the tabernacle. See Numbers 2 and Numbers 10.

Tribe Chief Verse Location 1. Judah Nahshon 12 2. Issachar Nethaneel 18 East 3. Zebulun Eliab 24 4. Reuben Elizur 30 5. Simeon Shelumiel 36 South 6. Gad Eliasaph 42 7. Ephraim Elishama 48 8. Manasseh Gamaliel 54 West 9. Benjamin Abidan 60 10. Dan Ahiezer 66 11. Asher Pagiel 72 North 12. Naphtali Ahira 78 It is worthy of remark also, that every tribe offers the same kind of offering, and in the same quantity, to show, that as every tribe was equally indebted to God for its support, so each should testify an equal sense of obligation. Besides, the vessels were all sacrificial vessels, and the animals were all clean animals, such as were proper for sacrifices; and therefore every thing was intended to point out that the people were to be a holy people, fully dedicated to God, and that God was to dwell among them; hence there were fine flour and oil, for a meat-offering, Numbers 7:13. A bullock, a ram, and a lamb, for a burnt-offering, Numbers 7:15, Numbers 7:16. Five oxen, five rams, five he-goats, and five lambs, for a peace-offering, Numbers 7:17. Thus, as the priests, altars, etc., were anointed, and the tabernacle dedicated, so the people, by this offering, became consecrated to God. Therefore every act here was a religious act.

"Thus," says Mr. Ainsworth, "by sacrifices of all sorts, figuring the death of Christ, and the benefits that were to be received thereby, they reconciled and made themselves and theirs acceptable to God, and were made partakers of his grace, to remission of sins, and sanctification through faith, and in the work of the Holy Ghost, in the communion and feeling whereof they rejoiced before God."

Numbers 7:12-17 And he that offered his offering the first day was Nahshon the son of Amminadab, of the tribe of Judah...

Numbers
Like the last part of Exodus, and the whole of Leviticus, the first part of Numbers, i.-x. 28--so called,[1] rather inappropriately, from the census in i., iii., (iv.), xxvi.--is unmistakably priestly in its interests and language. Beginning with a census of the men of war (i.) and the order of the camp (ii.), it devotes specific attention to the Levites, their numbers and duties (iii., iv.). Then follow laws for the exclusion of the unclean, v. 1-4, for determining the manner and amount of restitution …
John Edgar McFadyen—Introduction to the Old Testament