Flat-back acrylic cabochons (aka 'cabs') are so perfect for hat trimming because 1) They are super lightweight and 2) They have flat backs for ease of gluing onto your project. We adore these for embellishing headbands. 

This particular variety dates to the 1980's and are the best quality - Let's just say that they are as good quality as you will expect from acrylic! 

Metallic on top, the undersides are strange yellow and orange colours but it shouldn't matter too much if gluing down. 

Cabs measure 25x18mm.

Sold in a pack of 12 or a giant pack of 1 gross (approx.144 pieces).