Create recycled art by slumping and adding a fun swirl texture to a 12 oz bottle - perfect for colorful soda bottles! Reusable mold can be fired many times. Mold must be kiln washed before use. Swirls measure 1" to 2-1/4". See size perspective of mold with quarter image shown. Measures approximately 13" long x 4" wide. Exterior mold measurements listed. Find firing tips, schedules and bottle slumping FAQ's .PDF's under additional images. These will help answer your basic bottle slumping questions as well as give you tips for firing schedules. Project image courtesy of Creative Paradise.