PEPPERELL-Silkies 'O' Rings. These flexible silicone rings are a great addition to both jewelry projects and kids crafts. There are five colors (black, blue, red, white, and yellow) and two sizes (6mm and 9mm), all have an inner hole dimension of 1.5mm. This package contains 150 total pieces. WARNING-CHOKING HAZARD-Small parts. Not for children under 3 years. Recommended for ages 6 and up. Non- toxic. Imported.