Crochet cotton no. 40
Steel crochet hook US size 11

Plastic rings 5/8” diameter from outer edge to outer edge, 16

Gauge: Rounds 1-7 = 2 3/8” in diameter.

For mat 27.5” in diameter, use pearl cotton no. 5 and steel crochet hook US size 2.

Intermediate. A large center with small ring-centered motifs around the outer edge.

Pattern 3, page 6 of Decorative Crochet.
Pattern 13, Napperon Blanc, in 1000 Mailles.