Intermediate.

Size 20 crochet cotton and steel crochet hook US size 9.

Rounds 1-3 are 1 3/8” in diameter; each motif is 4.5”.

For a larger mat, use pearl cotton no. 5 and a size 2 hook: motif 5.5”

12 motifs are seamed together at points and edges of circles.

Pattern 7, Page 13 of Decorative Crochet.
Pattern 10, Napperon Blanc Rectangulaire, in 1000 Mailles.