Wax Melt Clam Shells Plastic Candle Tart Mold Container 12 Pack 16 Cell Plastic Round Clamshells Molds Hold 5 Oz capacity. PET material won't interact with fragrance or dyes.These wax melt clam shells are sturdy, with a tight seal to ensure candles stay fresh. Avoid Messy "Blow Outs" As These Wax Melt Molds Feature A Robust Cell Wall Thickness of 0.5 mm. Perfect for all types of wax or soap,the wax pour temperature for these wax molds is up to 150 Degrees F. Work perfectly with labels size 5-3/4" x 5-3/4"