I picked up the 100 Pieces - Round Circle Acrylic Blank Shape set and it's been great for keychain blanks and small ornaments. The 1/8" cast crystal clear acrylic feels sturdy, and the brown paper mask on both sides kept them scratch-free until I was ready to use them. The 1/8" standard hole is handy for hardware. One tip: stick to acrylic cleaner or mild dish soap, since alcohol can cause crazing along the edges. Sizes from 1" to 5" give plenty of options.