Clay Tailor Chalk The Carmel Clay Tailor Chalk is triangular-shaped and made of clay that adheres well to textiles, making it the perfect chalk for tailoring. It is engraved with grooves to provide extra grip for ease of application and precision. 2 Types Triangle Clay Tailor Chalk is a traditional triangle-shaped piece of tailor’s chalk made of clay.Square Clay Tailor Chalk is a traditional square-shaped piece of tailor’s chalk made of clay. Triangle Clay Tailor Chalk Square Clay Tailor Chalk Buying Options Buying Options Customer Reviews 3.4 out of 5 stars 2 3.9 out of 5 stars 11 Sizes 2 3/8" x 2 3/8" x 2 3/8" (6 x 6 x 6 cm) x 3/8" (0.4 cm) 2 1/4" x 1 13/16" x 1/4" (5.8 x 4.7 x 0.5 cm)