Five ultra-bright RGB LEDs in various lens types and sizes,  all in common anode configuration.

The sampler contains one each of the following:

RGB 10 mm diffused lens common anode LED -Diffused-lens 10-mm RGB LEDs with four leads, common-anode configuration. The big milky-white diffused lens provides excellent color blending. Highly recommended.
RGB 10 mm clear lens common anode LED -Clear-lens ultrabright 10-mm RGB LEDs with four leads, common-anode configuration. The water-clear lens projects high brightness for visibility at a distance
RGB 5 mm diffused lens common anode LED -Diffused-lens ultrabright RGB 5-mm LEDs with four leads, common-anode configuration. Excellent color blending. Highly recommended.
RGB 5 mm clear lens common anode LED -Clear-lens ultrabright 5-mm LEDs with four leads, common-anode configuration. The water-clear lens projects high brightness for visibility at a distance
RGB Superflux "Piranha" style clear lens common anode LED -Clear-lens ultrabright RGB LEDs in Superflux, or "Piranha" package with four leads, common-anode configuration. The pinout goes clockwise when looking from the top, starting from the chamfered corner, which is B, Common, R, and G.