They are made of a solid hard plastic material. They so have air pockets inside the rings so do not think the rings are defective. They are designed
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3.5 inch Mini Clear Plastic High Heel Cinderella Slipper 12 Pieces
Plastic Circles : TAP Plastics
The AdirOffice 24 inch x 48 inch x 1/8 inch Clear Plexiglass Acrylic Sheet is made from clear acrylic and lends itself useful to a myriad of projects. The sheets are able to be cut, bent, or formed as required for your specific needs. The Multi-Purpose Plexiglass is strong and durable. The plexiglass is a great solution for a number of needs due to its shatter resistant nature and overall flexibility.
AdirOffice 12 in. x 24 in. x 1/8 in. Plexiglass Acrylic Sheet (6-pack)
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White Plastic Hearts Background Cake Topper. 7 inch tall by 6.25 inches wide. 12 Pieces per package. Use these for DIY party favors to decorate for
7 Inch White Plastic Hearts Background Cake Topper 12 Pieces
12 Inch Ring
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the ring is rounded at edges
6 White Plastic Rings Decorations Arts & Crafts Accessory 5 Diameter
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2.5 inch 60mm Clear Acrylic fillable hangable plastic ornament balls for crafts are ?made of a heavy gauge clear plastic..The plastic acrylic fillable
2.5 inch 60mm Fillable Plastic Ornament Balls for Crafts 12 Pieces