Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Club | Location | Manager | Kit maker | Shirt sponsor |
| --- | --- | --- | --- | --- |
| ADO Den Haag | The Hague | Raymond Atteveld | Hummel | Fit For Free |
| Ajax | Amsterdam | John van 't Schip | Adidas | Aegon |
| AZ | Alkmaar | Louis van Gaal | Canterbury of New Zealand | DSB Bank |
| Feyenoord | Rotterdam | Leon Vlemmings | Kappa | Fortis |
| De Graafschap | Doetinchem | Darije Kalezić | kwd | Centric |
| FC Groningen | Groningen | Ron Jans | Klupp | Noord Lease |
| SC Heerenveen | Heerenveen | Trond Sollied | Jako | Univé |
| Heracles Almelo | Almelo | Gert Heerkes | Jako | Koninklijke Ten Cate |
| NAC Breda | Breda | Robert Maaskant | Klupp | Sunweb |
| N.E.C. | Nijmegen | Mario Been | Nike | Curaçao |
| PSV | Eindhoven | Dwight Lodeweges | Nike | Philips |
| Roda JC | Kerkrade | / Harm van Veldhoven | Diadora | Aevitae |
| Sparta Rotterdam | Rotterdam | Foeke Booy | Patrick | Graydon |
| FC Twente | Enschede | Steve McClaren | Diadora | Arke |
| FC Utrecht | Utrecht | Ton du Chatinier | Puma | Phanos |
| Vitesse | Arnhem | Theo Bos | Legea | AFAB |
| FC Volendam | Volendam | Frans Adelaar | Jako | Café Bar |
| Willem II | Tilburg | Alfons Groenendijk | Masita | Destil |
Question:
Ron Jans is a manager of which kit maker?
Answer:
Klupp