Are members of a struct also a type?

Question

The code below is from <The c++ template the complete guide> I don't know why it works, is left and right a type here too?

// define binary tree structure and traverse helpers:
struct Node {
    int value;
    Node* left;
    Node* right;
    Node(int i=0) : value(i), left(nullptr), right(nullptr) {
}
…
};

    auto left = &Node::left;
    auto right = &Node::right;
    // traverse tree, using fold expression:
    template<typename T, typename… TP>
    Node* traverse (T np, TP… paths) {
    return (np ->* … ->* paths); // np ->* paths1 ->* paths2 …
}

int main()
{
    // init binary tree structure:
    Node* root = new Node{0};
    root->left = new Node{1};
    root->left->right = new Node{2};
    …
    // traverse binary tree:
    Node* node = traverse(root, left, right);
    …
}