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Singer Class 15 transparent plastic bobbins Type: Class 15 bobbins. Material: Durable, transparent plastic. Quantity: 4 bobbins per pack. Dimensions: Approximately 12 mm height 21 mm diameter Essential sewing machine accessories designed for clear, durable, and easy-to-monitor thread supply. Compatible with many SINGER, Brother, Kenmore, and other front- or top-drop-in machines, preventing jams and ensuring even tensions. Never mix plastic and metal bobbins in the same machine, as it can affect tension. Always check the manual for the correct, officially supported bobbin, as using the wrong size can cause thread breakage or machine damage. Product code 2134 Item # L01643362763