Great Material: These replacement primer bulbs are made of plastic, which is reliable, sturdy, not easy to break, wear and practical. Compatibility: Primer bulbs are compatible with compatible 188-512, -23A small engines, compatible chainsaws, compatible BP42 Bolens lawn mowers and leaf blowers 125B 125BX 125BVX 530047721 503936601. Please note that our product isn' sponsored or endorsed by the it fits, including compatible , compatible and compatible . Widely Used: Our primer bulbs compatible small engines are great compatible lawn mowers, blowers, trimmers, chain saws, trimmer carburetors, etc. Suitable Size: Replacement primer bulb is measured about 2.2x2.2x3.46cm/0.86x0.86x1.36 inch. Please check this size carefully becompatiblee ordering. Colour:As Shown Material:plastic Package Contents: 2 x Replacement Primer Bulbs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.