Rectangle Resin Mold: Transparent, Flexible, Big Size; Outer Diameters: 18.7 cm in length, 13.7 cm in width, 1.3 cm high; Inside Diameters: 17.8 cm in length, 12.8 cm in width, 1.1cm deep, big enough to embed various elements, inspire your creative | Round Resin Mold: Durable, Lightweight, Regular Shape, Outer Size: 13.8 cm in diameter, 1.25 cm in thickness; Inside Size: 13 cm in diameter, 1.1cm deep, palm-sized, round shape is a good choice to DIY some meaningful & special artwork. | Heart Shape Resin Mold: Love Shape, Thick, Reusable, Outer Size: 15.8cm long, 13.8cm wide,1.25 cm high; Inside Size: 15cm long, 13cm wide, 1.05cm deep, palm-sized, a romantic choice to making a surprising and creative gift for Valentines Day, Mother Day, Thanksgiving Day, Christmas Day | Protective Finger Cots & Helpful Pointed Tweezers: Disposable finger cots effectively prevent your fingers from touching the hard-to-wash glue, save your cleaning trouble. And the straight pointed tweezers will be a big helper in adding some thin material or embedding some cute elements. | Premium Silicone: All molds are made of flexible soft silicone, resistant to tearing, won’t deform, durable & reusable, can serve you for a rather long time. And compatible with most resins or other casting materials such as epoxy resin, polyester resins, polymer clay etc.